Recently, when looking at those on-chain orders that "clearly I clicked to execute, but the result is worse than expected," it's basically either due to slow reactions or giving others tuition fees.

Sandwiches sound like opportunities, but honestly what you're seeing is slippage; what they see is your certainty.

I'm now more interested in monitoring the transaction distribution at the moment of liquidation waterfalls, to see which liquidity is just there to eat people...
Additionally, recently some regions are raising taxes and tightening compliance, then loosening again; deposit and withdrawal expectations are changing, and the on-chain impulsive buy-sell emotions are very obvious.
The more anxious, the easier it is to get trapped.
Anyway, I prefer to do fewer trades rather than become a fee source in "arbitrage opportunities."