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?
Basically, not every project will going to survive. Just like the idea of the "battle of the fittest", only those who can adapt and utilize themselves are going to stay. In the crypto industry, there is a lot of competition and those that is used by many and have a strong dedication will going to stay in the market.