You don't need to be in many projects. You just need a few good project and you're good. How to select those few... There are many ways to achieve that. As many of my friends explained here that you have to look for what it want to achieve. Is it something valuable or just to take your money away. Most important is the team behind it. Do they have history of something good then you can research it more and look for other factors.
Agree. We mustn't invest in too many projects, it will make us confused to manage our crypto assets. It also increases the chance to join scam or weak projects because having too many projects means to have an extra efforts to analyze them. When we analyze too many projects, we may not be very careful due to spending too much energy. That's why we are better to invest in a few projects only, choose the most convincing project that have strongest fundamentals.
Sure, when we choose a project, we must ensure the project has a good fundamental. They have trusted teams/developers, convincing products, clear roadmaps, good partnerships, and they plan to list the tokens/coins in reputable exchanges. These are some matters that we must take a look on the project before we decide to join it (buying the coins/tokens).