There are some ways to get the password of your wallet.dat by Bruteforce and not on the hex editor.

If you want to know about the method of getting the right password of your wallet.dat try to follow the guide from the link below.

- https://github.com/gurnec/btcrecover

It is free and opensource.
Be careful about dealing with a newbie or untrusted users like the above said they are most likely scam.