Buy cheap coins and hold them for a few years. You should make a profit of some coins you have invested in it. If you want to invest in bigger things.
I would prefer you to invest in ETH. It has the potential to grow. Many people are also believing this.
"Cheap" is a very relative term though. Coins can have a low price per coin and still be heavily overvalued... Also, picking random low market cap coins to hold for years is not a good idea either, since most are junk.