I struggled for many years to finish things and stay motivated. The last 2 years I've shipped several services and side projects. My high level suggestions are

I struggled for many years to finish things and stay motivated. The last 2 years I've shipped several services and side projects. My high level suggestions are 1) work on what interests you (duh) 2) work on solving actual problems you personally have. 3) get a job that lets you learn at work or doesn't take all your energy so you're still motivated on your own time. Might require a pay cut. 4) be patient with yourself through burnout. My worst burnout took a couple years to get through.