I have such a project I just can't shut down: https://myowndb.com/ I started it 20 years ago, with ruby on rails. I neglected it but then decided to rewrite it in F# and publish it as open source (https://gitlab.com/myowndb/myowndb). There are very few users, some from many years ago, all non paying. None gave any feedback I asked during the rewrite. I should have shut it down years ago, but I just can't take the step. I'm focused on another project now, but who knows, maybe I'll get back to it....