i forgot my restriction passcode

If you don't remember the Restrictions Passcode you will need to Restore your device as New.

https://support.apple.com/en-us/HT201252

Forget your Passcode

Forgotten Restrictions Passcode Help

iPad,iPod,iPod Touch Recovery Mode

About Restrictions (parental controls) on iPhone, iPad, and iPod touch - Apple Support

You will need to restore your device as New to remove a Restrictions passcode. Go through the normal process to restore your device, but when you see the options to restore as New or from a backup, be sure to choose New.

You can restore from a backup if you have one from BEFORE you set the restrictions passcode.