Actual future of BTC?

So I do DCA invest in BTC. Fear of missing out. About $500 a month, give or take. I've been doing it a few years now.

Recently, I started to think about BTC's future.

As of now I can use BTC to purchase somethings here and there. Mostly underground type stuff. But not a whole lot of legit things. For BTC to truly take off and hit big big numbers of like $1 million and so on. It has to be like a readily accepted currency? As in, I could go buy groceries with it?

Just trying to see what actual use BTC will or can have in 2030 or even 2040?

EDIT: ok i understand I think. Its probably never going to be accepted like cash is. But it's more of a hedge like gold in a sense. Which I understand. TY.