The third time I saw someone in the group shout "Whale is entering, quick follow," I still held my hand back.

That big transfer on the blockchain might not necessarily be an accumulation; many times it's just moving positions around or hedging risks.
Honestly, when you follow in, you might be stepping in to catch someone else's wave of volatility.
Especially recently, with cross-chain bridges having issues again, funds are moving back and forth more frequently.
What looks like an "attack" actually resembles a "retreat route."

My own habit is to wait: see if there's continuous adding of funds afterward, whether they are entering the same pool or using the same route in batches, or if they just move on to lending or collateralization after transferring.
After that oracle quoted an abnormal price, everyone started to "wait for confirmation."
I think that's pretty good—being a little slow isn't embarrassing.
When the fog is thick, slow down; don't rush in blindly.