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?
my experience so far, if you look at altcoins in marketcap, many of these altcoins consist of short-term investments. because not all altcoins in the marketcap are promising. if you want a long-term investment, then buy the highest altcoin like bitcoin and ethererum.