Downgrade snap as latest upgrade breaking the site because of high cpu usage

As the latest upgrade to 4.8.1 is not going smooth. The mangodb using lot of cpu and site breaks every 10 min.

Please suggest me the way to downgrade rocket chat using snap without losing my data.
My old version was working nice and cool. Please advise.

Server Setup Information

  • Version of Rocket.Chat Server: 4.8.1
  • Operating System: Debian
  • Deployment Method: snap
  • Number of Running Instances:
  • DB Replicaset Oplog:
  • NodeJS Version: v14.18.3
  • MongoDB Version: 4.2.17 / wiredTiger (oplog Enabled)
  • Proxy: caddy