to practice to performance level certain piece?
If you want to perform? - then practice everything to performance level .
not one piece. Could one really play one piece well and everything else not good?
Good technique take time, years to develop.
Passion, fire? - could one ever develop it?
And to perform - one need to perform all the time when possible, to your friends, neighbor, relative, at work anywhere you could - this is the best performance practice.
Sitting at home alone and playing for yourself will not bring you ever to performance level
I'd better speak by music...Please listen it on Spotify, Apple Music, Deezer, etc. Thanks!