LOL you must be joking about your statement. Your ethereum wallet can't be opened and why does someone need to buy your wallet if you can't even get your money?

You must remember your password and open your wallet and then you can sell your ethereum to the someone else. People will never try to buy encrypted wallet that can't be opened forever. That has become a useless thing for sure. Im sure that if you remember your wallet even you have sold it to the someone else and you will be taking back your ethereum from people who have bought it lol.

It's better to remember your password and sell your ethereum on exchange site.