Mexc Global is a good exchange, but there are other exchanges that are having good services too. If it is no KYC exchange, there are still some too like Kucoin.

You mk profit from trading, not because of the exchanges you that you are using.

I will advice people not to trade with many altcoins because altcoins re like gambling. In they go in the direction that is not favouring you, it would be a big loss.