Fedora 33 will go end of life for updates and support on 30th of
November 2021. No further updates, including security updates, will be
available for Fedora 33 after the said date. All the updates of Fedora
33 being pushed to stable will be stopped as well.
Fedora 34 will continue to receive updates until approximately one
month after the release of Fedora 36. The maintenance schedule of
Fedora releases is documented on the Fedora Project wiki . The
fedora Project wiki also contains instructions  on how to upgrade
from a previous release of Fedora to a version receiving updates.