/lit/ - Literature

Bit of a divergence, but any other anons who more consistently finish products have advice on improving focus? I have so many ideas and settings swirling in my head I have a hard time sticking to one until the end. My perfectionism and how hard I am on my work doesn't help either.
>make headway on story
>build setting (incl map & such if sf/f)
>decide it's shit
>begin a new one before I finish the last
Every time.

Anyway, I just revisited and reworked a 12/13 year old setting of mine and have gotten started on a new story set in it. This time I want to make it to the end regardless of the outcome. I want something tangible even if it's shit.

Any practical advice other than 'git gud'? Any advice welcome.