D major scale with Mississippi hotdogs and single notes. Keep LH fingers down as you go up each string. Use tips of fingers and try not to touch adjacent strings.
practice single note scale with a metronome. Start at 80 and work up by 5 bpm. Try to stay tight with the tempo.
a minor prelude. Practice each line separately with metronome start at 110 and work up by 10 bpm to 160. Practice whole piece with metronome. Same thing, start at 110 work up by 10 bpm to 160. Do not go faster until you’ve played the whole piece without mistakes at a given tempo.