In my life and work, I have met several people who, by their terrible fate, taught me an important lesson - we must be able to stop in time. Before other people no longer know how to get rid of us or we become victims of a microstroke (or worse).
You develop games yourself and for free, so there is no need for explanations here.
As for Silver Shields, now that you yourself see the problem, I can say frankly - I did not see how this game could develop. The scope of the idea is very large and there was no sense of direction. Perhaps in the form of several separate stories, this project would have come to life. Having rested and switched over, you can still see a new perspective for this game or find the strength to simply put an end to it in time.
In any case, you have already made so many wonderful games. Just a couple of weeks ago, I happily replayed Untouched by the Frost and this game perfectly helps with the too short days and winter blues. Therefore, I believe that you will still accumulate ideas and inspiration for new wonderful stories. And it does not matter how many years it may take. Just close the door and gather your strength and move forward.