If I reset my cell can I get all my data from iCloud
if I reset my iPhone 12 will the iCloud back up restore my data?
iPhone 12, iOS 16
If you backup according to the related article in the upper left corner, and if you restore that backup, yes, you will get your data back. That is the purpose of creating backups.
This may be helpful as well.
Restore your iPhone, iPad, or iPod touch from a backup - Apple Support