The methods are in the Azure portal. If you dont migate by the end date in 2024 then they will probably be migrated automatically for you and you may encounter some surprises. I would logon to the Azure portal and poke around to understand what needs to be done and migrate at your own pace with the ability to rollback.
You can also open a ticket with support and have them walk you through it now before everyone calls support with the same questions :)