I think it's important for you to hear that many - including myself - feel lost and don't know what to do with their lives and that's OK.
It's only natural comparing yourself to your friends from back home. Just know that they might share a similar sentiment to your life of travelling and freedom whilst they were raising kids and tied to mortgages etc.
In the grand scheme of things you're in a fine spot and not too old to dedicate yourself to something new or to put your degree to use if you wanted to. No one here is qualified to tell you what you should be doing with your life. This is a question for you to ponder, ideally by not comparing yourself to others but trying to figure out what you value and what you want your life to look like.
Wrt BTC, congrats on your diamond hands
. I can imagine it might not be the best for your overall well being having 99% in a very volatile asset. I personally believe BTC will be worth significantly more in 10 years time, but I could of course easily be mistaken. It's certainly not unreasonable selling some of your stack and put it in an etf/towards the next chapter in your life. I think it's worthwhile exploring how to generate yield on some of your BTC and use these proceeds to cover your expenses. ledn.io might be a good starting point, but note that these yields are not risk free.
Best of luck with whatever is next.