Better go and find more money, 30$ is too little for doing this.
But the main thing in my opinion just but some coin and wait 1-2 year. In this case you will earn good. If you want trade than it is just like lottery.
You are so right about the $30 being too small for any meaningful investment considering the rising prices of cryptos and the little that can acquire. The other part of your sentence isn't true. Trading is fun if you know what coins to buy and at what price. Also, you don't have to wait 1-2 years to make gains. You can profit within few weeks. Go ask those who bought:
Bitconnect
Binance
42coin
23 Skidoo.