The two possible ways to likely HODL bitcoin currently, is either you buy it or you earn it. As for the buying, it's quite simple since all you need to do is just swap some fiat for an equivalent amount of bitcoin. On the other hand some people render services like freelancing and other gig like you mentioned and depending on their agreement with the client , some get paid in crypto currency which includes bitcoin.

The only one I really don't think it would be easy to HODL is selling goods for bitcoin. This is because the seller is would likely have to restock sooner and that won't be long term holding except the profit of course is nice enough to HODL.

Your profile says you recently woke up. Well welcome back to the forum

Don't forget to keep your keys safe