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If you are still using CentOS 7.9, it's time to convert to Alma 8 with the free centos2alma tool by Plesk or Plesk Migrator. Please let us know your experiences or concerns in this thread: CentOS2Alma discussion
This would be a personal preference. You may open up a new can of worms by upgrading Plesk, who knows. If you have a nice backup/restore strategy in place, backup and update to 8.4.
The Plesk version doesn't matter for you. The only issues I can think of with psa 8.2 or 8.3 is Horde messing up, but the fix is listed in ART's wiki.