I am going to publish a new application, but I cannot publish it. Is it possible?
you can probably soon, see also the latest post from the Kodular team
I need to update my apps by November 1st.
Just extend the deadline as described here API Level 33 Necessary from August 2023 - #22 by The_K_Studio - MIT App Inventor Help - MIT App Inventor Community and update your apps using SDK31
You still have almost 1 year until your app will be undiscoverable as explained here