Thank you for contacting Samsung KSA
first we are sorry for what happened
After updating, you will not be able to downgrade to the old software because of updates to the
try to wipe the cache from the recovery mode
The Quick Optimization feature improves your phone's performance by identifying apps that use excessive battery power. It also clears away unneeded items from memory, deletes unnecessary files, and closes apps running in the background
from the device settings-device care-optimization-optimize now
also you can reset the app preferences from settings-apps-3 dots on the right corner of the screen -reset apps preferences
check your device in the safe mode and also keep auto-update on
Perform Interactive checks through the Samsung Members app (Samsung Members> Get Help> Interactive checks).
We hope this has been of some assistance to you. If you do have any further queries, please do not hesitate to contact us.
Hope you and your family staying healthy and safe!