[icontrolyourworld]

There's no single tip that is going to make you good or improve dramatically instantly unfortunately. All you can do is play a lot and fun while doing it! Challenge yourself on days where you are playing better than usual.

Small tips would be
Curl your fingers while playing, this is more relaxed and natural kind of like playing a piano, also it's good to be relaxed in general as you won't burn as much energy and have more stamina to play
stare lower on the screen as much as possible (if you read upscroll, otherwise visa versa) this gives optimal time to react to the arrows
on more comfortable songs aim for the best judgement as much as possible, thus increasing your timing, listen to your keytaps more if that helps
and i can't stress this one enough, play for fun! if you don't take the time to enjoy the files that you can play right now, they might not be as fun when you get significantly better.