This is a good time to go out cheap on Luna, yea it has lots of problems presently but buying at 0.77$ and selling at 5$ today is great return, not only that, just because this project has a big issue now doesn't mean its the end, this is not a financial advice but taking risk with just 10$ - 20$ might worth it.
don't be influenced by the hope of getting big profits, first examine the risks, all tokens experience ups and downs, sometimes we are at the best price, when we are eager to buy again, instead of profit, we side with the loss, LUNA is not so familiar, the ranking is not yet on CMC's best list, if you want to invest, try first to divide the investment percentage, don't be greedy, sometimes you lose a little bit on coin A and coin A's losses are covered by coin B.