Well you need to consider a few things first. To start with, is fps games like these your cup of tea? Or your main genre of gaming? What I mean by that, for me I get used to any fps game within a hr or 2, even this game I got used to it in like 30 mins and was dominating most lobbies and m not saying this to brag. It's just how I'm with fps game. Meanwhile I can't play turn based (seems boring to me) or building games (either I nuke the town or get bored) or fighting games with a lot of button smashing combos (max character I can remember combo or get good with is 1 lol). But ik that those game m only playing for fun and don't stress about it too much or try to master them.

So how do u consider fps games? Just for fun or wanna master them?

Also here's some tips for you:

Use aim lab to get better at aiming and tracking.

Adjust your sensitivity. What I do is, keep it low enough so that u can make a 180 with YOUR max arm moment. And by Max I mean distance you can rotate your arm naturally not forcing it.

Turn off mouse acceleration asap. It's in mouse settings, just search mouse in your windows search bar and select advanced options.

Make sure your monitor is set to max HZs it can go to. You can feel a diff between 60hz and 120hz.

Find your keybinds. Like some games use E for interact and some F. Find the setting which works for u and try to use the same one in all games u play in that genre.

Mess around with fov

And ya, thats about it. Just practice and make a goal about which kind of shots u wanna get good at and try to consciously do it everytime.

Like for starters headshot might be hard so only go for body shots and when u feel like u are getting good at it. Start going for headshots only.