SDK 33 support is already being tested in the test server in version nb194. It will probably be released in the next few days.
If (1) your app still does not target SDK 30, which is the minimum requirement, and/or(2) you need to update your app and SDK 33 isn't available on the main server, here are steps to request for more time. This will give you a time extension until November 1, and by then AI2 should be updated. Otherwise, you do not need to do anything until App Inventor releases nb194 in the main server.