I have locked myself out of my Iphone 11ProMax

Have you forgotten your passcode?, See this Apple article: If you forgot your iPhone passcode

https://support.apple.com/en-us/HT204306

OR Unlock Passcode -> without a computer, see this Apple article:

How to reset your iPhone, iPad, or iPod touch when you forgot your passcode

https://support.apple.com/en-us/HT212951

Have you forgotten your Apple ID?, check your Apple ID via your email box, see this Apple article: If you forgot your Apple ID

https://support.apple.com/en-us/HT201354                  

OR see -> Having trouble signing in?

https://iforgot.apple.com/password/verify/appleid

Have you forgotten your password? -> See this Apple article: If you forgot your Apple ID password

https://support.apple.com/en-us/HT201487