I mistakenly misunderstood my secret key during an airdrop and are stole all the tokens that arrive ... is there no way to secure the account now?
If your private key has already been exposed to public then all people who see it can now access your wallet aanytime so best to do is just disposed that wallet and create a new one. be careful next time. Write your eth wallet on notepad or anywhere you can access, copy paste it when you so you wont commit same mistake again.