MacOS partition isn't working properly

Today I was deleting a partition from my MacBook that I thought was completely unrelated to my MacOS system, when a diskutil error popped up. Almost immediately my Mac rebooted and the System i was working on seemed completely gone, so much so that the machine rebooted in internet recovery mode.

There I installed a new macOS system on another partition (the one i was trying to delete) and ran diskutil list from there.

The result was this:

 /dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *251.0 GB   disk0
   1:                        EFI ⁨EFI⁩                     209.7 MB   disk0s1
   2: FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF ⁨⁩              177.3 GB   disk0s2
                    (free space)                         11.4 GB    -
   3:                 Apple_APFS ⁨Container disk1⁩         62.0 GB    disk0s3

as you can see, my new macOS volume is just fine (disk0s3) but the original macOS volume (disk0s2) turned from APFS to FFFFFFFF-FFFF-FFFF-FFFF-FFF, and in my opinion this means that I need to reset it to apfs. I also checked with a Recovery third party app and all the files are still there, meaning that all the data is just under a layer of "unknown file system" that prevents my mac from reading it. I saw another guide here to solve a similar issue (this thread) but I'm too illiterate to solve anything adapting to a different system with two SSDs each running different things. Any help would be really appreciated. Peace out.