Just make sure to invest on top altcoins on
https://coinmarketcap.com/ because it has bigger volume and you will expect something from there if you keep checking it a lot. It's really good for both day trading and just simply for hodler, or maybe just look at your preferred exchanges and look at the most volatile one for bigger potential of earnings if you are into the risky stuff.
Top altcoins are overvalued now and it is impossible to earn big profits on them. That is why many people prefer to invest in new and prospective projects. But a lot depends on the tools that project offer. It must be useful like this