Any coin you like
I can recommend investing your money using etoro and copying popular investors. By copying other investors you can let them do the transactions for you in a, usually, profitable way. I've been doing this since march and I've got over 8% interest. Thing is, you don't need to have much knowledge about investing and there are a few which are bringing in stable profits.
Try to diversify your portfolio, different investors investing in ETFS, Stocks, Raw materials, crypto etc..