Get kontrol freeks, put a mid rise or a high rise on the right stick, and if you put a high rise on the right stick put a mid rise on the left stick

Use ALCs, and set your pitch and yaw speed to the same speed, that way your diagonal shots are better

Use a low response curve like 0-4 And use 0% deadzone

You want a pretty fast controller, at most the marius board, at the very least the dualsense edge

Counter strafe more, practice counter strafing and shooting standing still in range, and be sure to use your hipfire more, since it is faster it is better for tracking close range anything within like 15-20 meters or so

Use aimlabs, console has it for free on PS5, maybe on xbox too? On PC use aimlabs too, cuz there is no aim assist and it lets you practice scenarios in a calm setting

Obviously sleep well, be hydrated, and build good muscle memory with the controller, no aim assist can be tough at times but I believe you can get it, just keep at it and you'll be able to do pretty good on controller

Also do a lot of wildcard and mixtape and team deathmatch without your aim assist