I would strongly suggest follow both the advise from @ Matti Haveri as well as reading from the link they were so kind to supply
The computer in question appears to be a 24" iMac ? that can come figured with a 256GB SSD as it can come configured with a larger drive
Would we be correct in thinking, because you are so concerned with /System/Volume/Data taking 222.11 GB of space
That this machine has the Entry Level 256 GB drive or possible the 512 GB drive ?
In either case and only after you have exhausting All possibilities provided by my colleague
The more popular and effective ways to address this issue is to Start Over from Scratch
For Apple Silicon computer >> Use Disk Utility to erase a Mac with Apple silicon.
Always make a Time Machine Backup before proceeding
It is also suggest to Only Migrating the User Account and nothing more.
Emphasis on User Account Only
Reinstall the Needed, not the Wanted applications from the Apple Apps Store or Directly from the Developers