In regards of getting help, I suspect in the first instance posting here is a good start:
Obviously the re-booted boards are all a bit new, but there’s a coders group you can register for too (I think you can only apply for one group in each 24hrs). Exactly how that group works is really a question for @grotlover2 (in the fullness of time - I imagine he’s really busy right now).
You may be suprised that people want to contribute to things for free, for a little kudos, or just because they’ve the chance to help make something they like the sound of happen. Afterall we all get enjoyment out of playing these things at the end of the day.
You’ve already made a start by putting SotFK on Github. Having distributed source control makes code contributions so much easier. Even if it’s simple asks like “Can I do x better?”, being able to see the source as a whole makes it easy for the rest of us to suggest things. Maybe start any new project on there? Oh yes, and code assuming someone else will be reading/changing it so comments and JavaDoc (or it’s equivalent). It requires a bit more discipline and time for sure, but it does pay off, even if that other person is yourself some years down the line!