Why would you have to abandon it instead of just keeping on in your preferred pace? If anybody wants more rapid development they can fork it, not your problem.
I mean: who doesn't want to work full time on their passion project? Especially when I'd just been made redundant, I feel most people would do the same.
Some people also have tried the paid new feature prioritization where it later lands for everyone. I think it worked in some projects but project must have been really good otherwise.