I think you must first look at your target Audience. Likely younger tech savvy crowd. Your efforts would b wasted at a nursing home.
Tweeting Cryptocurrency links might work.

Tweeting to countries  with unstable currencies could work. Look at Hong Kong and Iran, where people are burning banks to the ground. Some links may help people find the information they need to invest safely.

Nowadays, most have heard of bitcoin. Still many think it’s a scam and wouldn’t know how to get into it even if they wanted to.  One could sprinkle small leaflets at places like college campuses and nightlife hotspots where the young tech savvy reside.  Simply scan the code and the link would bring them to various crypto sites, where they could learn and invest safely.

When the price is down, new people don’t  want to buy in.   But they may be willing to learn -to mine crypto. Again This would likely be for younger tech savvy target audience.