Not to be that a-hole, because I do appreciate the labour of love thing, but looking at your project and the fact you said you are mostly on your own now, I would probably suggest you reconsider your path, instead of going foward regardless. Look at TDM, its a team effort and with lots of brilliant people slaving on it for years, and its still not complete. Making a map alone, without worrying about art or code, just focusing on that, building a place, adjusting the scenes, getting it right, for a single person that can take months or even years to finish. So, going alone is sure to end up in exhaustion. This is none of my business and everyone will do whatever they want, but perhaps you could take your concepts and your existing material and migrate to a new community, a new engine, like Godot for example, there seems to be a lot of things going on there. Its also the sort of engine a single person can in fact move things along by himself, because its meant to be a user friendly, DIY plataform, unlike say Idtech.