The fact that four restarts produced no features is the answer, and it is worth looking at directly rather than around.
You have run the experiment four times. Each time the result was the same: enthusiasm, repair, exhaustion, stop. That is not bad luck repeated four times — it is a reliable finding about this project and this life, and the only thing that varies is what you tell yourself at the start of each attempt.
The question that unstuck me was not "is the idea good". Ideas are cheap and yours is probably fine. It was: what would have to be different for attempt five to end differently? Not vaguely — specifically. More time? You do not have more time. Less rot? The rot comes from the gaps, and the gaps come from the stopping. A collaborator? Then the task is finding one, not restarting.
If you cannot name something concrete that changed, attempt five is attempt four with a different date, and you already know how it ends.
When I finally shut mine down the surprise was that it was not sad, it was relief. The project had stopped being a thing I was building and become a debt I carried, and every month I did not open it was a small failure. Ending it deliberately turned a recurring guilt into one bad afternoon. That week was the most productive I had that year, purely because the background process stopped running.