Things I've done that I would recommend, if you haven't already:
• Pilot a small plane. Feeling in control of flight is mindblowing.
• Sail out of sight of land on a small boat. That completely empty horizon, nothing to see but water and sky, is pretty wonderful. You feel tiny and inconsequential, but in a good way.
• Climb a really big mountain. The world looks very different from up around 23,000, and seeing the curvature of the Earth is wild.
• If you're in the northern hemisphere, go experience the stars of the southern hemisphere, or vice-versa. It's a very subtle and perception-changing experience.
• Have a mushroom trip. I had my first only a couple years ago, and I wish I'd tried it decades earlier. Not only is it theraputic for depression and anxiety, but it sure does change your expectations of your own mind.
• Build something you can and will use day-to-day. Maybe only a bench, or a bookshelf, but start with raw materials and end with something useable.
• Work with a horse. Ride one, groom one, care for it, gain its trust. Humans are predators, evolutionarily speaking, and working with prey animals like horses is a completely different relationship from anything else I ever did. Be warned: it's life changing and rewarding beyond your imagination. Whoever said "dog is man's best friend" never earned the friendship of a horse. It is both humbling and exhilarating.
• Go rock climbing. It's a hell of a rush to look down past your feet and see a bird glide past.
• Travel the entire width of your home country, on the ground. Driving, bicycling, whatever.
Bonus round, if you can manage it: save a life. Not metaphorically, but literally. Get in there and do CPR, cut someone out of a wrecked car or pull them out of a burning building, pull them out of the water before they go under. It's an experience you won't forget. If you do it more than once, you won't forget any of them. I expect it's as primal as taking a life (which I haven't done), and it is profound.