@Mitchell T.
I plan to do some trading among the top 3 to 5 highest volume cryptocurrencies. I like the opportunities provided by the volatility and would do it essentially as a day trading operation. I would commit a small amount of money, and very speculative, also not passive, since trading requires a close eye on the market, unless you are willing to trust an auto-trader. Very much in the "getting educated" phase with this, learning candlestick patterns, etc. Also need to get a better understanding/ trading model of the tax impacts.
There is another more passive opportunity that I haven't really looked at but intend to explore eventually. On the Binance exchange, you can act as the lending bank for other speculators buying on margin. You get paid your fee automatically, whether their trade gains or loses, and your money is only out of pocket for a few days, or the length of their trade. Any margin calls for the speculator happen automatically, so your principal should be protected.