just buy bitcoin and HODL, lowest risk.
other than that, I invest in BitShares currently. Check it out.
Bitshares is an altcoin as far as i know, so
why not invest in other staking coins which can result in increase of the original amount too.
dmd has a decent future plan and also got a nice value at present.
That is only if the value of the coin does not decline tremendously. Since the earnings are so small, it probably won't cover the decline. Even if it doesn't decline, trading and transaction fees would eat a large part of profit as you exchange it to BTC or cash. Even without all of that, the richest person would have a monopoly and hence you won't earn much.