actually $50 is a very little amount for investing.so you can try earn from this forum by social and signature campaign.and when it will a big amount then invest in only high ranked coin. Xrp,eth, and also i suggest you to buy waves coin.bedt off luck
It is a small amount but if you know on how you will invest that money, you can grow that in no time. Investing to different alt coins or certain alt coin like ETH will give you a certain amount of profit. Actually there are a lot of choices in the crypto market and you just need to do the math or where you are comfortable to invest.