An idea from @bee in another thread that sounds relevant to the general problem of actually finishing things instead of always starting new things: Beeminding crafts - #3 by bee
Specifically this bit:
Right now my major problem with crafting is starting things and never finishing them, so I’ve got a very low rate / long term goal to finish things, with 1 finished object due per month. I can enter partially finished objects, but I can’t jump around once I enter something. So I estimate this dress I’m sewing is 80% finished, and enter a 0.8, then I’m committed to finishing it (or frogging it) before I can start counting something else… I’ve only made it through a few months, but it seems to be going well so far!