I can see what you mean and you won't have that itch scratched until you find what drives you. I'm an outdoorsman myself, but a few goals I have are building a rally car initially purchased under $1000. You would be able to teach yourself some mechanics without breaking the bank. That skill will transfer to many things. I can't stress the kind of debugging it takes to work on a car. It's debugging code in hard mode because to 'test' your code you have to buy a part. Forces you to really think about things.

You could also start hiking taller and taller mountains. 14k or higher is where it starts getting fun. The mountains get as high as you want.

Learn how to ride a motorcycle. Super useful if you live in CA. A lot of people think its too dangerous, but honestly a little danger is good for the bones. We put ourselves in too many bubbles. The long-term goal could be to ride down Baja.

Have you tried to pick up cooking? Make advances recipes? You could have a goal of cooking for a huge party and everyone being amazed at the food.