Ok, thanks.
Let's go over that.
With the newer versions of macOS, their internal drives are formatted in APFS. One change is that what used to be called Partitions in HFS+, are now called: Containers. Both of these can have one or more volumes; however, only APFS offers dynamic volumes.
When macOS is installed it is actually placed amongst a number of volumes. The core of the operating system is in two volumes. By default they would be called macIntosh HD & macIntosh HD - Data. Somehow yours got renamed to "OS" and "OS Ventura - Data" respectively. These are seen in the result as disk2s9 (System) & disk2s8 (Data). The System volume is read-only and sealed. You cannot, and should not, try to modify it in any way. The latter is where your data is stored.
There are also a few "supporting" volumes that make up macOS.
They are:
- disk2s2 (Preboot)
- disk2s3 (Recovery) << This is your Mac's Recovery "partition".
- disk2s4 (VM)
Ok, what stands out, although it is taking up very little storage space (1 MB) is disk2s7 (OS Ventura - Data). What it looks like either you, or someone else, was "playing around" with the Disk Utility and created a new APFS "data" volume. This typically happens macOS was reinstalled to the wrong APFS volume and Disk Utility was not in the "Show All Devices" view when doing so.
The one you want is mounted as: /System/Volumes/Data. That would be: disk2s8. The one you will want to delete is mounted as: /Volumes. That would be disk2s7
The second issue is that the volume you want, disk2s8 has a size quota imposed on it. Again this would happen via the Disk Utility. It does NOT happen automatically. Currently, as you can see, that quota is set to 50 GBs. That's why there is so little disk space available for your data.
