What if there is no “forgot passcode?” Button on the screen
What do I do if there is no “forgot passcode?” Button on my iPad screen when I put the incorrect passcode more than four times cause I forgot my passcode?
iPad (9th generation)
If you forgot a passcode that you changed within the last 72 hours, see the "If you recently changed passcodes, use your old passcode to temporarily sign in" section of: If you see a iPhone, iPad, or Apple Vision Pro unavailable message or Security Lockout screen - Apple Support
Otherwise, see the other sections of that article
If neither of the above is an option, you will need to use a computer. See: If you forgot your iPad passcode, use your Mac or PC to reset it - Apple Support