[wolfgang]

practice with a metronome!

record yourself and listen back

once you can play a piece through at a certain tempo, play it even slower a couple times and then at the target tempo. playing it at a slower tempo more often than the target tempo.

to practice moving your hand/fingers into positions, set the metronome really slow, play the first position, move your hand/finger way ahead of time to where the next note(s) is then wait for the right time to play the note. this makes it so you hand gets used to being in position before playing the note, otherwise you can end up rushing your hand into position and not really being on target when you try to up the tempo.

if you are playing through a piece with the metronome and make a mistake, keeping playing, do not stop and repeat the section. you need to be able to keep playing in the face of mistakes. otherwise you'll end up having a studder in your playing. but do go back to the section and work it out afterwards. it is ok to replay sections if you are just figuring out the notes with no metronome going to get hand positions/fingerings sorted out.

also, once you can play a piece through, let the metronome click and look at the music and imagine playing it and hearing it in your head.

learn music theory. that will open up improvisation. you could just play chords in the left hand and find notes/lines/melodies in the right hand.