Did you follow a particular doc? Which one? No
Act in haste, repent at leisure.
Patience and reading is the best way to avoid a mess.
Downgrades:
While Rocket.Chat does not officially support downgrades due to the changes made during database migrations, it is possible to manually roll back migrations separately if necessary.
However if you upgraded say from 7.10 to 7.11/12/13 you may well hit issues.
Method to upgrade is here, but the only guaranteed ‘downgrade’ is via a backup/restore.
Then I think I’m going to bin the rocket chat server and move to a paid hosted version.
Probably a good choice if you are struggling with this.