I think that currently the best cryptocurrencies where you can invest your funds start from 10 and above and some below on CoinMarketCap, those are Cardano, Stellar, EOS, and other. Moreover, it's good to invest in ICOs as well, but you have to keep in mind that the team should be good, their technology should be amazing and to secure yourself it's better to invest in the ICOs who have 2 phases, and it's better to invest in the second one, so you will be able to see what projects didn't get fundraised normally. For example I have recently invested in one of the ICOs which is called Cryptics, these guys have developed an AI trading platform which makes very accurate price forecast on different cryptocurrency pairs.