Start slow, metronome at 65bpm. Put your pick on a string and play open string arpeggios, down-up-down-up with the click. Each time, reset your pick on the next string before plucking through. Aim for consistent tone quality and volume.
When you're satisfied, move up to 75bpm and repeat, moving up in tempo over time. If you make a mistake, restart. If you make two mistakes, back up and do it slower again.
Speed is not the goal. Tone and timing are the goals, training your pick hand to relax and your mind and body to feel the beat.
Once you get to around 90 bpm, go back down to 65 and start playing eighth notes. Follow the steps from above.
This should take you a week or more to complete. Then go up into higher tempos. Every mistake, roll back 5bpm
You can also try various arpeggios patterns and string combinations.
Good luck!