Hello, I forgot the password i put for my backup encryption. How do i solve this ?

i’m sorry to tell you that the only way to restore this backup is by remembering the password you have put for the encryption, I hope this article is helpful for your case

If you can’t remember the password for your encrypted backup - Apple Support

The only possible "solution" is for you to remember the password you used to encrypt the backup or just move on and set it up as a new device.

Without the password, the backup is unreadable.