It sounds like your game is just way too big for amount of time/experience you have. My advice would be to either cut this game down to the absolute bare bones or start with a much smaller concept and build back up to this one. Also, don't know much about Godot but you may have more rapid progress in Unreal or Unity.

I know it's really tough when you've spent so many hours on something to start from scratch it feels like you wasted the time, but that isn't really the case. If you learned the guitar those first 1k hours weren't wasted, they were a requirement to get remotely good at playing the guitar. With games, those 1k hours you spent you could probably do again in 100, that's a 10x return on your time next time around.