Well, you'll already got some steem power in your wallet, which is cool imo :) Steem power is currently my favourite crypto, but other people might suggest other cryptos to consider e.g. Bitcoin, Litecoin, ethereum, and others.

But investing in crypto is not for the faint hearted!
If you'd invested in ethereum around 4 months ago, you could have made something like a 7x return (however chances like this are pretty rare and may be unlikely to repeat much in the near future). But, if you'd invested a month ago you would have lost half your money :(

I would suggest it's best to do a lot of research first in order to know what you're doing. Also, a key rule is "don't invest more than you afford to lose", because in crypto it really is possible to lose just about all of your investment (if markets are bad, or your choice of crypto is bad)!