Recently, I saw a bunch of new L1/L2 incentives to boost TVL, and old users are complaining "mining and selling."

I'm actually more concerned about another layer: the MEV ordering/queue jumping, in simple terms, it's someone who can see what you're about to do first, then decide where to stand.
The ones most affected are not "whether you'll make money," but that you think clicking on an exchange means you'll get the price at that moment, only to be sandwiched or experience slippage, which over time becomes an invisible tax.
Market makers/arbitrageurs are not all bad; they provide liquidity, but when the ordering rights are too concentrated, ordinary people can only bear the uncertainty.
Anyway, I now prefer to go slower, split orders, leverage less, rather than fight against unseen front-runners head-on.