The actual act of exercise is pretty miserable for most of us. It's the hours in between exercises that for better, for me. I just generally feel better when I'm exercising more.
It sounds like you're getting plenty of exercise, so it's time to check into vitamins, meditation, mindfulness exercises and whatever else.
In your shoes, I would keep exercising, to keep that variable controlled while I tried the next change.
Great analogy.
I think it's fair to tweak it and leave that second library with full accountability for the lack of desirability.
Domain names don't start out undesirable, they build their reputation from the content and users.
So it's like building a second library in a perfectly nice spot, and having that library attract people who dump pollution into the surrounding area, making it undesirable.