Call it being in a rut, or a funk, or getting the blues, but please don't say like prison unless you've experienced prison. What you're describing is close to the opposite of my experience in prison.

Every day was one day closer to release, to being able to see and spend time with the people I cared most about. I saw dates on the calendar approach and looked forward to them. I never had much opportunity to be bored, and there were plenty of activities I could engage in, even during 24 hour lockdowns. I was forced and encouraged to eat fewer calories (at first at least) and lost a lot of weight, making me much healthier. I had goals I was very eager to work toward, but artificially put off because I couldn't do them while locked up.

This sounds like a mid-life crisis. Your SHBG levels rise with age and your free testosterone levels are likely low. Getting looked over for TRT can potentially help.

Having a middling career isn't enough for a lot of people. Why aren't you in the 1% killing it? A lot of them have problems, but having more money than you know how to spend is a source of contentment for a lot of wealthier people.

Wrapping it up with a quote: "I never worked a day in my life. It was all fun."