Recently, testing the testnet points feels a bit like doing exercises, originally just to practice the feel, but as I keep doing it, I start thinking "what if there's an airdrop"... When expectations rise, it's easy to get carried away.

My simple stop-loss method: set a limit for myself (time/fees/energy), and stop once reached, even if there are still tasks left, I won't push myself.
I've seen many sudden gas spikes in the mempool; today I save two bucks, tomorrow I might spend ten more, it's not worth it.
The set of staking/sharing security "compound yields" is now being criticized as a scam, which is normal—basically, the risks are layered and passed down, so don't take testnet as real money to chase after.
By the way, now I tend to screenshot and save any strange transaction paths I see... in case I need to reconcile or call out later.