If I had 80k in btc I would be creating businesses rather than buying companies.

Bring back local manufacturing with value added products, buy up a bunch of cheap industrial land and reopen the factories refurbished. Buy iron ore and turn it into steel etc.

If I had that much money I'd be able to live comfortably and leave something for the next generation with a fraction of it.

So I'd sink a lot of it into things I think would improve my countries economy and my local community.

I'd sponsor some people to run for the local council, completely change how thingy are run, cut the rates and make them voluntary, cut the office staff and employ more workers etc.

I'd make a geoengineering business and devote my time to that. Greening deserts type stuff, but mostly just to drought/flood/fireproof individual farms. (Read water for every farm and you'll know what I'm talking about)