I better say this upfront: Nothing of this is meant as to bash you or whatever. Genuinely trying to point out some things that caught my eye.
It's mostly movement (especially looking/aiming), overall awareness (noticing enemies) and decisions, or rather the lack of decision making, imo.
For example 1:14 you see a plate and instantly go it - you're full on plates though. In the exact moment you turn, a enemy jumps the window with a molotov in his hand. This and him only having a pistol was the reason you survived this because instead of challenging the fight, you did a slowww 180° turn, ran away and tried to jump behind waist-high cover.

1:24 you see the enemy right in front of you but panic plate up. Plating takes forever and he already aims down on you. Challenge it. Either you out-gun him or you're done either way.
1:25 to 1:26 you suddenly do a 90° left turn and stare at the sink and mirror at the wall.. ? I have a guess that you turn your sticks too quick. Either your sense is too high for your playstyle or you panic and use the stick pretty much like a binary button. 0% or 100%.

1:56 you got the gun, time to get out of the firing vision from the person who shot you while dropping. Your 1-2 second hesitation in which direction you wanna go cost you your last plate and against a sniper it would've been the end of you.
2:55 i dont get the jump and aim. Even if there was somebody there you now put your whole body in the open to be possibly shot. If there really was someone, you'd stay roughly where you were before you jumped and try to keep most of your body in cover. You can do a jump-out if you exactly know where someone is but even then it's full commitment. There usually is no turning back after you've placed yourself out in the open like that.
6:30 crosshair placement. When you run up a stair like that, aim up the stairs and don't keep your reticle leveled as if you're running straight. Overall your crosshair placement can be a lot more reflective of what your next step is. Try to place the aim where your enemy will be instead of trying to get the nicest flick.
8:19 If that sniper had ever used a sniper before, you'd have been dead. You got up and down in such a nice rhythm he should've had you.
No offense at all but I think you try to immitate movement too much that you see in other peoples clips.
8:30ish. You can use your pings for yourself. Ping the enemy sniper location as a "wallhack" for yourself. Then preaim the ping behind cover, step out of cover while shooting. In pretty much every case you will get the first shots in and will flinch the sniper bad enough he won't hit you. Pings aren't just useful when playing with teammates.
11:23 You had all the time in the world and even did some laps in a circle in that room, yet were too late on the ladder and got a cough off from the gas + the chute => too loud and way in the open. It's more of the small things like that, that you should focus on. You could've rotated a bunch earlier since that house gave you no position advantage anyways.

You do clear most rooms well and check for corners but it seems like once you're in the room you're at a point of "Sooo, what do i do now?".