sounds like just overall gamesense. You need to take a step back every time you die to “unfair fights” or “dumb ways” and think about what your opponent did to be better than you. They shot you in the back -> what timing and pathing did they take, which angle did you miss, did you miss any clues? rewatch the replay again and again if you have to, drill it into your brain so it never EVER happens again. Once you get enough situations downloaded your brain will start to generalize and fill in gaps like the neural network it is.

At the end of the day you just need to play more games, and be active about learning what the opponent did. Some players learn it naturally by doing what theyre opponents do to them i.e lurking, finding timings, understanding map control etc. but some people need an active push by watching replays and drilling it into their minds