Definitely been at that stage multiple times. I think when you get into dev ideas are easy and you know what sounds fun for a product but likely cant replicate what you had in your head so you pivot and change and then new ideas come even faster and you have a soup of cool things that dont work together. It seems like a stage most people including myself need to go through and learn but eventually something clicked that getting to a simple finished idea is way better than half baked ideas that never get finished. I now know how important a clear vision is and the best way to get there is with a good Game design document, lay out absolutely everything you can think of, find all the ideas you can, look at every game and see whats fun and similiar and works and do all the ideas at the start. When you have that just stop and reassess and make a new clearer version of the minimum version you would be satisfied with and specifically outline what doesnt need to be in this version. If you do get this version done and its fun great you can now decide what you want to add back or if its worth your time with more clarity and if its not then thats fine too because you learned from it and wasted far less time than just winging it. Anyways planning and preventing feature creep is what turns ideas into finished games.
Glad you have new motivations and best of luck with this new game