Hey folks,
Just to clear up a few misconceptions here:
If you created or linked a platform to your EA account after October 26th, you can still take part in Cross Progression. This is the date after which no content would be merged from the linked account, but it doesn't prevent you from using Cross Progression once that is enabled for your account.
Cross Progression will not be enabled for everyone at the same time, and is being rolled out in waves. You will see a notification in-game once your account has been migrated which tells you everything that was merged.
There's nothing that can make this process happen faster for an account, so please avoid unlinking accounts to try and speed this process up as that will only result in lost progress from the unlinked accounts. Progress cannot be transferred from one EA account to another.
If you've already unlinked an account and need to re-link that to the original EA account to recover your progress, you'll need to contact support for assistance re-linking the account.