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 make profit from trading, not because of the exchanges that you you are using.
I will advice people not to trade with many altcoins because altcoins are like gambling. If they go in the direction that is not favouring you, it would be a big loss.
We can't do anything if there are still many of us here in this forum investing in altcoins especially meme coins, because let's face it there are not many who venture that they can get 100x -1000x the profit.
After all, we always tell most people to trade what they can afford to lose. Now if he is making profit from the strategy he is doing, he just repeats it until he gets a profit, that's how simple it is to understand.