I recently made a list of partially-done side projects. It's long. I set a target to not start any new projects. Unfortunately, the fun part is the first part. Taking something that works 90% and dealing with edge cases and polishing it is (for me anyway) far less exciting than hacking together prototypes.
That's the truth for everyone who hacks around in their spare time, but: don't stop starting new things! I've got a folder full of half-finished crud, which will probably never be finished. I've become OK with that. I do, admittedly, keep one or two larger ideas on the go now, that I do try and work on, just a little, everyday... but the "not starting anything new" goal is a bad one. It led me into one of the most depressing years of my life; I'd constantly feel self-pressure to work on the "big stuff", rather than hack away on little things, which led to a (severe) degradation in my happiness, and in my work performance.
So, yeah. Definitely try and finish one or two that you deeply care about, but creating new stuff is what we do, and there's no shame whatsoever in a folder full of unfinished ideas.
