Cryptocurrencies are like startups/companies...

If you want to invest time and have the technical knowledge, invest time in reviewing whitepapers and teams.  Then join their telegram and ask questions.  If they are very active on their project, invest in those that you think will bring in business (and therefore demand on their coin) and HELP THEM build what they are building the best you can.

If you don't have the technical knowledge or simply don't have the time, simply build yourself an "index" of the top crypto to minimize your risk, wait 2-3 years and sell them for profit.  It will probably be less risky but it will also probably have lower returns.

Hope that make sense to you.

Thanks,
Steve