It starts by yourself accepting it and signify it. Put a sign on your shop, your website etc... Give discounts when ppl pay you in btc. Ask your boss again and again, even if they laugh at you.

And of course, there's the hardest part, convincing others. If you're bad at it, like me, well ... then let the others do it. Live your best life and the others will come to you.

You can also move to a place where it's much more accepted and used.

But yeah, we're just still in the fiat world, that's it.