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

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.

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