Recently, I've seen people complain again about unfair sorting, MEV front-running, and blaming miners/validators... I can understand that, but I'm more worried about opening the door for others.

Don't screenshot or upload mnemonic phrases to cloud storage; it's best to write two offline copies and keep them separate.
Use your hot wallet for daily small transactions, and don't mix it with your main wallet.
Don't authorize everything with a single click; when I see "unlimited authorization," I usually close the page—I'd rather earn less than risk it.
For phishing sites that mimic official websites or fake airdrops, I pause for three seconds after clicking the link, check the domain name, look at pop-ups, and review the authorization details—it's better to be slow than to lose.