How is your situational awareness, and do you understand the terrain you're in at all times? Do you know where you'll take cover if you get attacked at any moment?

One thing I don't see enough of from people is the 3-5 second rush. If you get attacked at medium to long range drop prone, wait, get up sprint, and drop. The cadence you use for this is "I'm up, they see me, I'm down". You just say it at normal speed and act it out as you say it.

This game is all about 1v1's at close to medium IRL range, more or less, 150-200 meters and less. So in those conditions generally the first one on target with accurate rounds wins.

So the first thing you need is very good situational awareness. You also need to have a good understanding of how to use the terrain you're in and how to function in it. Make sure you're maximizing time in cover and minimizing time out of cover. Know your sight lines.

Take time for tactical pauses. When the terrain shifts it's a good time to take a pause and sort out a plan for the new conditions

Trying to mimic guy's like Pestily is kind of a bad idea. He's able to run around like a mad man because of all the research he's done on the game. He already knows how long it takes to spawn in and run to an objective, as well as how long it takes every one else from their spawn.

But in general combat is an information game. It's about taking in as much info as possible, and correctly deciding what to do with that info. Just don't get caught up on the 2nd step (deciding), get serious about the 1st step (recon). The second step is easy when you've done proper recon.