What is the most important factor to check when buying a coin for long term,
Market Cap, Circulating Supply, Total Supply or Trading Volume?
Because most of the coins are pumped, price is high but their trading volume is zero.
For me they're all considered as the main criteria for investing Altcoins either short-term and long-term because there's nothing more secure and safe investments if you're going to just invest into random and new Altcoins that promises that they're promising and more chance to become the next Top Altcoins.
Trading Volume is the most important criteria of them all that you mentioned above. It proves that the coin is worth of more investments and investors.