Open Settings → Delete account. There is no waiting period and no form to fill in. Your profile, your email address, your settings, your uploaded images, the messages you wrote in group chats and your liveness result are erased, and the account cannot be signed into again.
Write to the support address published on the app's store listing from the email address the account uses. We erase the account and reply within one month, as the GDPR requires.
Two things outlive the account, and both are somebody else's record rather than yours. Plans that already happened stay for the people who were there, with your name and photo taken off them. Safety reports filed by or about the account stay with moderation — otherwise deleting an account would be a way to clear a report.
The full detail is in the privacy policy.