OP wanted a fun child project, but it’s not fun anymore, just responsibilities.

The problem I see is just a difference between expectations and reality.

Expectations were: it would be fun to give people something for free, create open source, be part of some community. Maybe even get some recognition, maybe better job offers.

Reality is: noone cares about your open source project enough to pay for it.

And such is life. Noone stops you from just stopping working on it, and that’s an adult option. All open source licences have a clause like “I don’t own you nothing”, and maybe that’s the moment to use it.