I just spent half a day checking on-chain data and found that one transaction in it took almost ten minutes longer than my wallet. Actually, it wasn’t that the chain was slow—my RPC node had already served someone else first.

Look—what you call “on-chain” is really a secondhand world. Nodes, indexers, even block explorers filter everything at every layer. You think you’re running at the very front, but you’re actually viewing a map someone else already drew.
Recently, Meme and celebrity shilling have been taking turns. Old players always keep yelling, “Don’t grab the last baton.” But to put it bluntly, it’s not that the last baton only happens when the price drops—it's that you think you saw it “immediately,” but you were already late.
Discipline matters more than talent. This also holds in trading—get used to waiting a few seconds before charging in, get used to checking RPC latency before placing an order, get used to admitting that what you see is always half a step behind. Like a ball, the reflex isn’t about price—it’s about human nature.