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.
I would invest it all into altcoins while joining a signature campaign. Cryptomarkets have a huge selection of altcoin but only some of them have potential. a lot of altcoins are useless and are used to scam ICO investors. if you pick the wrong coin, dont expect to get your money back. That being said, if you do your research, you can make huge profit by picking the right altcoin to invest in.