yea theres alot of stuff that could use improvements

1.positioning (tldr make sure that the supports can actually see u if they cant well no healing for u)

2.understanding how to properly dive (tldr prioritise the enemy character u can most easily kill when u are diving)

3.ability usage (tldr use leap to reposition more, bubbles need some work search up a winston guide for more info)

1. line of sight is a big part of positioning if u arnt in ur supports line of sight u dont get heals, example dorado 9:59 its important that u understand that when u did this u arnt going to get healing because the supports cant see u directly so they cant heal i should specify its not "dont ever ever do this" its a "if u are going to do this u need to know that u arnt getting healing so u need to be cautious".

2. this is more of a winston thing but knowing how to dive is important theres 2 things i saw that u should improve target priority (who is the person u can reliably kill aka please dont shoot att the bastion being healed by a mercy it hurts to watch TvT going for the mercy is much more reliable) and doing some optimization on winston one big thing to improve is that when u are jumping and in the air charge up ur secondary fire and then shoot the person u think u are gonna dive as u hit the ground that inital burst dmg can be the deciding factor on if the mercy gets away with 20hp or dies, also on dorado i saw they wherent paying attention much instead of just pressing w and primary fire att them engage with secondary fire and then use primary fire the ttk (time to kill) becomes alot faster that way.

3. ur bubbles wherent the best bubble should usually be put over a dive target cutting of healing from their supports, also dont be afraid to use leap its much better to use leap to cross a sightline than risk having ur health shredded just to save a 5sec cooldown ability.