Honestly I think the best tip that isn't immediately obvious for this is to not play the same song too much, most people will just perform worse if they keep playing the same song over and over, to the point where just going for a different song might be better.
That is not to say you can't replay a song a lot if you want to get an impressive score on it, but taking breaks from the song is probably gonna make you do it in less time played. You have to gauge yourself if the time spent is worth it for the score.