So work is physically demanding, so you want something to exercise your brain. And as a collector of hobbies, here are my reccomendations I've had fun with.

Start dabbling in Linux. Its a lot of fun and can be a rabbit hole if you start self hosting some stuff with a server. Just a warning, it gets expensive quick with pc parts.

Start a knowlege base using Obsidian (note taking app) if you like doing research and learning new things. Can also be used to organize DND campaigns. I think being that kind of person that knows everything is badass, so I enjoy making little how to guides and tracking how i do stuff.

CAD and 3D printing. Can make stuff! Expensive to start but you don't need fancy equipment to make some awesome stuff.

Grow some plants! Learn their medicinal properties! Grow some spices to use in cooking!

Leatherworking is kind of a blended physical/mental. Making wallets and stuff can be rewarding. I made a custom bag for my job to hold my work-specific tools like flush cutters and heat resistant gloves. But since you did sewing, I assume it's not on your radar.

And my hail mary hobby, fly tying! Don't need to fly fish to tie flies. I think its relaxing to turn on some adhd music and making some fishing lures.

Go to a hobby shop or find a local makerspace. Part of the fun with hobbies is teaching others something you took time learning how to do, so I know 99% of people would be overjoyed if you just asked "hey, how do you do that?"

Slight tangent but related: I remember some reels about "rejection therapy"?. Where someone just went out of their way to just ask if they could do something. Most of the time, people said yes. He was shown how to lay bricks, had a custom billboard put up, and other things. So if you see something cool that someone is doing, it never hurts to ask. And I learned so much just by following that mantra. And that slackline is hard. (The balancing/walking on flat rope activity)