Top 500 coins? Isn't that much and what can someone be possibly doing with 500 coins, will he be able to keep track of it in cases like swapping etc, well in my own opinion it's much. Also, I do not think one can also see top 500 altcoins with actual and applicable use cases, most of the coins in coinmarketcap have nothing other than hype which gradually fades and the project forgotten. Nevertheless, I do not hold many coins, I only hold those which have something to offer and hence can last long term, and of course, the first in my portfolio is Ethereum, we know how it has been growing and how the team have been trying to upgrade it and so on. Secondly, Binance coin, this is an exchange coin whose team are also experts in bringing in new features. XLM, Tezos and ADA also made my list because their teams are one of the best, and to me, once a team is active and serious then the coin will be a valuable one.