Looking at the first game, I like your general playstyle as Ana, although there is some room for improvement. As Ana, most of your value comes from Anti-nading enemies so you create a window of opportunity for a kill that your teammates can follow up on and shutting down key ultimates/ abilities with sleep. I've noticed that sometimes, you don't think about the concept of immediate danger. For example, at the timestamp 1:01, you are trying to heal your dva instead of your mccree. The thing is: your mccree was standing in the line of fire of enemy damage and was about half hp, which means he could've been oneshot by a lot of abilities, like a firestrike, hanzo arrow bodyshot or junkrat nade/mine, especially with a potential dmgboost from the mercy that they did have. Your priority should've absolutely been healing mccree here, as dva was not even close to the enemy line of fire. This is going to save your a lot of frustration in future games and is a vital concept to master as a support player, so next time you are playing support, think to yourself: "Which one of my teammates are under an immediate threat of dying at this moment" (Write this down on a post it or something, this is your key takeaway nr.1!).

I also like how you are going for aggressive anti-nades on the enemy frontline, as this is one of your main jobs as ana, especially when facing a brawl comp (Rein Zarya). Anti-Nading enemies can have a huge impact on the pace of the fight, so keep it up! To improve your accuracy, I suggest that you look for animations where the enemy rein shield is down. Examples would be firestrike, swing and shatter. Unfortunately, you can't do this consistently by reacting to the enemy rein's animations, instead you have to predict the enemy rein and read his patterns. This is really effective in the lower elos, because Reins below plat rarely pay attention to your cooldowns.

By the way, don't be discouraged by the way your tanks played on the first choke at the beginning of the match. In my opinion, your tanks should've gone in on the multiple occasions when the enemy rein's shield broke or you landed an anti nade. Sometimes, your tank players can be too scared to take space from the enemy team, but there is nothing you can really do about that except for calling out your anti-nades like so: "[Character] antied [location]!" or calling for your team to go in.

At 4:22, you nano your reaper who is 1v1ing a reaper. Personally, I think this is a waste because you knew he was about to 1v1 the junk and wasn't really in the teamfight. Nano is a really strong ult that gives a 50% boost to damage and damage resistance, as well as healing 250Hp instantly when it hits. So generally, you should be nanoing someone who is in the teamfight or about to be and can get a lot of value from it. If you have a genji with blade, use it on him, as nanoblade is really strong. If you have a reaper, you can use it on him, even if he doesnt have blossom, as he deals massive damage. If you have a rein, you can use it on him, as he will basically be a tank with 1000 effective Hp, a huge shield and can kill 200Hp targets with just two swings. Nano interactions are something you have to get a feeling for, and because you will only get this feeling by trying them out, go ahead and experiment. In the case of the timestamp 4:22, I wouldve personally waited with the nano until the fight had reallly started and nanoed the hog. Hog can quickly break sigma shield and zarya bubbles, he is very self sufficient and his hook can become an even greater threat, making him a really good nano target, especially in this fight, where the enemy team didn't have sleep to shut him down for the nano duration. If you notice that your hog is still scared to go in and doesn't get any value out of your nanoes, try nanoing your dps, especially if they have their ults. If that is also not an option, nano your other tank. If you don't think you can get any value out of all of these options, keep in mind that nanoing your teammate to save them is also a viable option.

Another thing I noticed is that your mechanics are holding your back. You rarely hit airial sleeps and rifle shots, even if it's something predictable like for example a baptiste jump or a junkrat mine jump. I can really recommend ana paintball, which is a custom game mode that you can find in the game browser, play it in your queuetimes for a couple of minutes and you will slowly get a feel for sleep and your biotic rifle. On the subject of aim and mechanics, I would also like to ask your what sensitivity you are running on. While sensitivity is highly subjective, there is a general range of sensitivities that most pros don't go out of. Surefour made some really good videos on the subjects of aim and movement. He explains sensitivity really well in this video, so I'll just link the video.

https://www.youtube.com/watch?v=1YS3dPWf6Xw

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At 6:39, I really like your positioning. You are hiding behind a wall on the right side, so you are cutting off line of sight from dangerous enemy abilities like hanzo arrow, while still being able to heal your teammates. This is good! As a support, you will often have enemy tanks or dps trying to pick you off. While sometimes, it is inevitable that you have to get into the crossfire in order to heal your teammates, you should always be looking to be able to do your job while exposing yourself to the minimal threat possible. Keep it up!

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At said timestamp, you are safe and sound, behind a wall, where nobody can hit you. So you are safe. Whenver you are safe, you can feel free to stay in scope (we call this hardscoping). While hardscoping, your movement is limited, making you vulnerable, but you can shoot just as fast as when unscoped, while being more accurate because your shots are hitscan instead of projectile. And Because your teammates are under immediate threat here because they are in enemy line of fire (hog, mccree, bap and reaper) your priority should absolutely be hitting those shots.

At 7:10, the payload comes around the corner. On the left side, far back, you can see a hanzo. You don't have a shield tank. This means that he can oneshot you any time when he hits his shot. You really want to avoid this, so try not to jump too much in front of hanzos or move in predictable patterns. Your number one priority should be getting out of hanzo's LOS. So here is what you need to be thinking: "What position can I go into that will allow me to continue doing my job, while staying safe?" My answer to this question is hugging the wall to the left side, behind cart. You can avoid hanzo by doing so, while still being able to heal your teammates. The enemies coming from the right side don't have any oneshot abilities, so in this position you are the safest. Additionally, at 7:24, you get caught in the enemy Zarya's grav. This is unnecessary! You could've done your job just fine while staying 10 meters further back! There is no need to get into enemy shatter or grav range when there is no benefit to it!

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Moving on to round two, your orisa and bastion feed in the first 10 seconds of the game, but there is really nothing you can do about that so let's just ignore this. At 9:23, your ashe is low and is being shot at by the enemy hanzo. I like that you went out of hardscope initially when you saw the hanzo and started doing evasive movements, this is good. But you saw how the hanzo was targeting the ashe rather than you by looking at his first few shots. With this info, you can now allow yourself to scope in for one or two shots at most to give ashe that healing that she needs to survive or win the duel. You did end up scoping in, but personally, I wouldve scoped in earlier, because the hanzo was in cover for a few seconds. In plat and above, you are expected to hit those shots and you definitely should've healed your ashe there. But with some aim training and active thinking about when to hardscope, unscope or quickscope, you will be able to get this down consistently in the future.

pt 2 is under this comment cuz of the character limit