How to play one hand louder on piano

1. How do you play one hand louder than the other on piano?
2. How can I make my left hand softer on the piano?

How do you play one hand louder than the other on piano?

Practice for a few bars the left hand alone in a cycle and then add the little passages from the right. Try to lift the fingers of the right hand a little higher, depress them a little faster, and keep them on the keys a little longer, as if you insisted on the note.

How can I make my left hand softer on the piano?

I'd make three suggestions:

1. play some Bach.
2. play some pieces with a staccatto in one hand and a legato in the other (even scales will be fine for this)
3. play the piece deliberately trying to make the LH louder, then try again trying to make it softer, then try to vary it on different notes/beats.