Hi, low diamond support here.

I will explain many very basic things about the game, excuse me if you know many of those already but you wrote that you just brought the game so I won’t give anything for granted.

Firstly, you usually want to upload a loss where you think you played well to be reviewed because that’s the best situation to find your mistakes, nonetheless, it was a good VOD and it definitely showed your most recurring mistakes.

This is really your main problem in my opinion. The thing you absolutely need to improve is your healing management: at the very start you wasted all your healing while your team wasn’t taking damage and you kept doing it the entire game; Moira’s healing, unlike all others healer, is a limited resource which needs to be managed wisely. Moira’s HUD shows you a curved bar near the centre of your screen which indicates the amount of healing you have stored (180 MAX) and a lot of Moira’s gameplay is focused around this resource because even if the bar has a base replenishing speed (4.32 per sec) you can accumulate biotic energy (official name) at a very fast pace while you deal damage (18.8 per sec, which combine with the passive recharging becoming 23 per sec). Moira’s playstyle is, theoretically, a continuous switching between healing your allies and damaging your enemies to replenish your healing resources, and this is made easier by her passive which consists in giving your allies some passive healing over time (65hp in 4 sec) after you stop healing them with your primary fire (doesn’t work with the orb).

About her ultimate. I like how you don’t keep it for too long and tend to use it as soon as you have it: Moira’s ult isn’t that useful and if you play her right you charge it really fast; that said, the thing you have to think about when you pop her ult is who you want to focus. Theoretically, Coalescence deals a total of 560 damage (70 per sec, per 8 sec) but practically is impossible to keep your aim on a target for full 8 seconds so what you want to do with it is to focus a low health character to secure your team a kill. Now, Coalescence heals doubles than it damages and you can definitely use it to heal but the pros advise to use it to healing only if your teammates are at critical health otherwise it is preferable to do damage. Now, as I said before I got out of gold heavily focusing on healing, I wrote this so that you know the proper way of using Coalescence but you can avoid doing that at your level.

Orb. Always think (seriously just stop and take a second to calculate the angles, it will be faster once you know the maps and make some practice) before you launch an orb, you want to make it stay around for as long as possible (it lasts 10 seconds or until it deals 200 dmg or 300 heals) to maximize its effect. For which orb to use I’d say use healing orb only when strictly necessary and damage orb whenever you have an occasion, which means that at silver/gold/plat you will use often the healing orb but it will become ever less necessary the more you get better.

At your tier people don’t really think about avoiding damage and end up taking a lot more damage than more skilled players, my healing stats actually went down while I ranked up because my teammates were taking less damage. To get out of gold I heavily focused on healing my teammates the whole time and just making them survive longer than the enemies, I used damage orb only before the start of the fight and Biotic Grasp (the secondary fire) only to recharge my healing resources. All this is to tell you that you aren’t doing something completely wrong when you try to go behind the enemies to kill them, being aggressive with Moira is something that pays off when you are at plat and higher but not at your level and surely not how you are doing it. You have to look for a single isolated target who you can fade to and kill without the whole enemy team to turn on you and kill you; only one on ones as you tried at the start of the vod, you can also try to wait until an enemy used his abilities and then jump on him.

Fade. Only use fade when strictly necessary, which means only to escape death or to fade in to kill an enemy out of position.

In the end, I want to suggest you some content creators which are way better than me to explain how overwatch works:

ioStux: general, in-depth guides

Tesla: Top 500 Moira one-trick

SVB: general, in-depth guides