i locked myself out of my iphone

If you can’t successfully enter an iPhone’s passscode, your ONLY option is to reset the phone … completely erasing it … and restoring from your most recent backup.

See these instructions:

If you see an iPhone or iPad unavailable message or Security Lockout screen – Apple Support (AU)

Note: If your phone is running iOS earlier that 15.2, you’ll need to follow the instructions linked near the bottom of the article.