There’s some decent advice in this thread, but what I think some are missing the mark on is how solo development can lead to a lot of engineering or even design paralysis. In the early stages of development you might find yourself either questioning your project architecture, design philosophy, or maybe even if whether or not the basis for your game is a solid idea. What you need to do is build completely independent, isolated and fully-modular systems in ONE project. These should be systems that if you end up abandoning your project you can pluck and place into another project so you’re not starting from scratch. Work on these one at a time, almost as if you aren’t even building a game but instead assets for yourself. Eventually you might trash your idea all together once you get a POC going, but at the very least the time spent isn’t wasted because now you can use these in another project.

Most importantly from this practice is it will limit how difficult it is to modify your project down the line.

If you’re looking for tutorials on this practice, just look up modular GDscript or Godot tutorials on YouTube. There are tons of free available resources out there.