I'm having a problem with my Steem account, I can not remember the password, I have tried to restore, but all attempts failed, someone please help me. Thanks so much
If you can't remember your password your are out of luck. It is like losing your Bitcoin wallet (private keys). Gone.
Recovery works if your password has been changed and you can provide the previous one (within 30 days).
Possibly, someday, there might be a way to recover from a forgotten password, but there is not right now.
The only thing you can do at this point is get a new account.