I’m reposting this:

The mid life crisis is just a natural manifestation of the human condition. Younger people are getting them now and it looks different. See severe anxiety, depression, gender fluidity, etc.
I offer this idea from one of the most important books I've ever read--Zoochosis.

This is from a little book review.
quote:
This is one of those books I wish I could get everyone to read, especially my adult children. But it has “God” in the subtitle (and in the content), so it’s not likely that all of them will read it.
quote:
In the first half of the book, Mr. Noble presents the problem: we live in a world that is inhuman, a world that is not set up for human flourishing. He uses the analogy of a lion caged in a “natural habitat” at the zoo. “Zoochosis is the common term for that thing that lions do at the zoo when they obsessively pace back and forth in their cages.” Noble argues that we experience our own form of zoochosis as we vainly attempt to adapt ourselves to the world that we have made for ourselves in our ambition to be the little gods of our own lives.
You are Not Your Own by Alan Noble

Take on more responsibility. Serve and give to others.
I'm not where you are because I have a wife and a one year old so I am always needing to serve my family in some way.
But in your situation (perhaps the kids are grown?) you might need to seek out how to serve.

The entirety of this life is seeking to be comfortable in this world. But in reality, we were never made for this world, but for another.
Realizing that is the key to happiness (see CS Lewis).

If you don't believe this concept just take a look at the far left and the far right. In many cases, politics is all those people have.
It's just one of many paths people take to cope with life.

Work is not the answer.
Sex is not the answer.
Hobbies are fantastic to a degree.
Family and friends is best, because the love that we exchange with them is indicative of what we were truly made for.