You must trade daily to be able to collect profits quickly
because the capital is not so big, then you should continue to be careful
because you have to play all in

To be honest $50 is so small to do investment because if you invest a large amount of money you will get a huge profit too. But anyway if i have that money i will invest a coins that is good, reliable and promising because if you put your money on this way you will gain a higher profit just to repay back my capital. Much better if you have $50 you've save it first until the money goes up.

With this amount, I would not expect a quick and big profit . I don't even know what to recommend.

$50 is quite too small for investing in the large cap coins like BTC, ETH etc. In situations like this, you can take the risk and invest in new coins like Lympo (LYM) or Docademic (MTC). These coins are taking the Blockchain to another level in the health sector.

50 dollars is very few and I think it is just waste of time. You can earn more than 50$ from airdrops and bounties. However, If I have to give advice, you should invest in risky coins because they can make easily 2x or 3x.