Just now I was again foolish: a single swap failed, and the gas was free.

Looking back, it’s not that the chain was congested, but I placed the order too hastily, with slippage set too tightly, the pool depth wasn’t enough, and the person front-running me was faster.
To put it simply, when the depth is shallow and you still want to “execute in one go,” you’re just waiting to be pushed by the price, ending up either failing or executing at a worse position.

I later changed to splitting the orders, testing with small amounts first, watching the transaction speed before adding more, and not fighting myself.
Another small habit: before placing an order, refresh the quote first. If it fails, don’t get emotional and keep retrying; the market has already changed in those few seconds of queuing.
Recently, meme and celebrity calls are flying fast, and newcomers really shouldn’t take the last leg.
Pay attention, as focus can easily drift, and the depth can suddenly become empty…
Anyway, I now prefer to go slower and pay less tuition.