Recently, more and more people are watching whale addresses to follow trades.

Let me pour some cold water first: just because you see them buy doesn't mean they are "bullish"; they might just be using spot holdings on the left and opening shorts on the right as insurance, hedging, and then casually boosting their emotions.
Especially now, when funding rates are extreme, people in the group are arguing whether it's a reversal or just more bubble squeezing.
Anyway, I'm more worried that you're following their risk management, not the actual direction.
When looking at on-chain data, don't just focus on inflows and outflows; also check their related exchange positions, stablecoin deposits and withdrawals, and whether they are gradually accumulating in batches...
Otherwise, it's really easy to become the bagholder.
If you get it wrong, so be it—at least don't lose because of overconfidence.