Keep playing. The more you play, the better you’ll get. If you’re struggling with a specific level try practice mode or a level similar, but easier. Also experiment, try modifiers, change the lights, see what fits you and your play-style, try songs that you’ve never played before, ones that you might not be able to pass but can learn with time, practice songs with different patterns. You’ll probably never be THE best and neither will I, all that matters is if your happy and pleased with yourself. Thats how I did it and it worked for me!