If all goes to hell in the way you’re describing, that number in your bank account will do nothing for you. You could, as another comment suggested, get into prepping as your hobby but just based on this post I’m thinking if shit truly “went down” I imagine you don’t really want to stick around for it.

For that reason I think you should get something you can afford, and keep some money around for exploring new hobbies. That will remove the irritation of renting but you’ll be responsible for everything which could be a new set of irritations. You have, as you say, no desire to do anything. I don’t know how you pass time now but to me, that means you should try new things and see if they stick.

Go for a couple hikes, take some pictures while you’re there (especially if it’s in nature, like a forest). Try playing some video games, read some interesting books, cook a few more intricate meals. Start learning another language. Try something creative like writing, you don’t have to share it after or try to make money from it, just doing it to do it. It doesn’t really matter, just if you think of an activity you haven’t tried recently, give it a shot and if you like it keep going.

Not every day all the time, but maybe a day or two a week you attempt something. Even if that doesn’t necessarily help, at least it keeps things interesting. All I’m getting at is “Number goes up” hasn’t worked so far, so try something else. And so what if all goes to hell, when it does would you rather be right and have done nothing because it didn’t matter or would you rather have enjoyed a few things in the meantime?