You need to build/create something physical, imo. Most other recommendations I saw are some flavor of consumption.I have a hard time finding things that I find enjoyable. Gaming is enjoyable some times, but too rarely. I used to love to read books, but that was a very, very long time ago. Now I'm mostly binging youtube, starting with serious interesting thing, and quickly degenerating into youtube shorts with narcissistic hot girls (or Anatoly pretending to be a cleaner, those are actually really funny, you should look it up). Those "thumbnails", man... Caveman go whoop whoop. I also love working out, but the body can't handle more than a few times per week. Playing online co-op with friends can be awesome, but they grew up for some stupid reason and don't have as much free time as I do.
I recently deactivated Facebook and Twitter (now X). Peoples lack of basic logic made me rage quit. Spent a looot of time debating there. Young and naive.
How about you?
I think you need to suite that advice to your own particular interests, but a few very small ideas that are easy to get started with -
1. Get a Dremel, a few tools and some bleached cow bones from the pet store. Carve necklaces/earrings. Try to carve Maui's hook. I got into this about 10 years ago because I already had a Dremel laying around and I had very little shop space, but wanted to make something with my hands. Obviously it's frustrating at first, but it becomes therapeutic quickly. It took me about a week to make a decent one the first time.
2. Cardstock models. I got into this for a bit after my daughter was born because it's whisper quiet and I could do it while she was sleeping in a chair next to me. Dirt cheap and quick payoff.
I wouldn't blame you if neither of those appeal to you, but the general idea is creating something physical, not having a screen in front of you, and not having it be a "chore". Personally, I am much more relaxed and at ease when my recreation time is something that's improving my skills in something, whatever that is.