Currently on the coinmarketcap site only about 1590 projects compared to at times more than 1700 projects. They have left many projects without developers or scam projects. I personally invested in some of these projects and lost a lot of money like bitconect and centra. Do you trust the projects you are investing in and will keep them for a long time until they succeed or are they just looking for profit in the short term?
This is the inevitable rule of the market. Poor projects will be gradually eliminated and replaced by good projects and bring real benefits to society. What you need to do is to thoroughly study the project before investing because if the investment in the project is not good you will lose money. Conversely, if you find a good project to invest you will make a lot of profit.