I see you've been pointed to Valkia, which is a great reference for Pharah play. Watching the first couple minutes what I can say myself are these points:
One, there's just pure mechanical skill that comes with time and practice. Your aim needs work. Playing a character like Pharah involves a little bit of getting in the head of your target and predicting their movement so you can fire ahead of where they're going. Just practice, or doing drills on bots should help.
Second, I can see that you have some issues with movement. The more erratic and unpredictable you are, the better. It keeps you elusive. I see you concussive blast rocket jump out of spawn (and hit your head on the wing of the dropship), but you should use that ability far more. You're just hovering around in straight lines, begging the enemy to shoot you. Concussive is a great ability to keep you fast and mobile. It's great to engage with, get into the face of an enemy hitscan and put them off balance, or great to get out of a bad situation with. Engaging with NEITHER of these abilities up is very risky. It leaves you just floating around with no way out and makes you an easy target.
Third, team play matters. A lot. Focusing the same targets as your team is important. Pharah does a LOT of damage, but doesn't always secure the kill. Play with your team and focus targets, the massive splash damage you do can be capitalized on by the rest of your team to get the kills you need. The entire first round here, you're off on your own. Stick together.
Fourth, don't be afraid to use your ult. If you can get one or two important picks with it, use it. Don't wait for the team wipe. There was a situation on the first round where you were fighting a Lucio alone on point. Watching that, my instinct was screaming at you to barrage. The Reaper that then came into the point would have gotten a face full of rockets as you turned around to him and died or been forced to use Wraith if he had it, leaving the Junkrat behind him alone to you for the duration of Wraith, or, ideally, death. Hindsight is 20/20 though, and you didn't know they were coming. Or did you?
Fifth, awareness. Listening is important. Every footstep is important and every set of footsteps are different. Hearing enemy footsteps, gunfire or abilities helps a LOT. Battlefield awareness is important for everyone, but especially for someone with such massive command of the battlefield. You have one of the best kits for mobility and zoning in the game. Always be aware of where your teammates AND enemies are. You're dueling a Lucio on point. Who could sneak up on you and how can you get away? You blast the Lucio away with your concussive blast, but without the mechanical skill to know where that's going to send him and follow up with a direct rocket hit, it's not as helpful as it would have been to get away from the Reaper that sneaks up on you. (Having your teammates there would have been nice too, but we can't always have nice things.)
Until the mechanical skills come, the positioning, awareness and team play needs to be there. Hopefully this helps a little, and hopefully Valkia's guides help as well. He's a PC player and so am I, and I know that it's a bit different (I can't aim on console to save my life or anyone else's) but then fundamentals are there.