Notes

1:23 - First thing i notice is that u use a cooldown just to get to the other side of the high ground. while i understand the idea behind holding the other side, i think it's more important for u to start by ur team
1:50 - while i get the fight was already sorta over and people were just resetting, i think your target focus could've been better and maybe gotten a pick that could stop the potential snowball. this is ideally a healer or the dps that's the most threat to you (in this case, the mei, since she can take away your escapes by slowing u down)
2:26 - should've continued up along the high ground and tried to drop behind the frontline. doomfists's strength lies in his ability to catch people unawares in the backline and get a fast pick, not being a frontline dps that can take a lot of damage all at once
2:47 - ok rollout, surprised the roadhog just got away at first. really good job following back up on the hog tho and finishing the kill and pushing his really aggressive positioning
2:49 - probably should've gone for the backline, especially since the mei was already pretty low health and would've died without your ult. gj turning and punching the ulting cree, good awareness
3:10 - good place to be
3:28 - good attempt at a punch, nice escape. kind of lucky but hey u survived so
3:36 - kinda messy, just gotta practice jumping on people more
4:25 - that felt kinda awkward, almost like u didn't know where to go. make sure to plan every engagement with a way to get in/out and have a reason why ur going into a fight
4:39 - good idea to ult there, unlucky getting pulled out of punch
4:57 - aim your punches on someone less tanky than a roadhog, the last few punches u've aimed for have hit that Large Man
5:02 - OOOOOOOOOOOOOOOOOOOF unluckers
5:42 - going this route to help your healers crosses over literally every sightline of the enemy, letting them turn and focus u instantly. gotta play with a concrete plan in mind - will i play by the healers and play to peel attackers off them? will i play to secure picks in the backline? etc

a lot of the issues of dying a lot i think stems from just not having a solid idea of where you want to end up, like there's a lot of indecisiveness in where you position yourself. definitely watch some of the more recent overwatch league games in the league viewer and only watch where the doomfists position themselves/who they target in each fight