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?
Generally I don't invest to these type coins, it was obvious that bitconnect would be like this and with my friends we didn't invest to it never so you must be careful. I invest to reliable projects like ripple or cardano because they are good projects and there is no doubt about them.