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There's not much gained from cleaning up further data in home directories but snapshots take a considerable amount of disk space:

martchus@s390zl12:~> sudo btrfs filesystem du -s /
     Total   Exclusive  Set shared  Filename
  45.29GiB     6.95GiB     5.49GiB  /
martchus@s390zl12:~> sudo btrfs filesystem du -s /home
     Total   Exclusive  Set shared  Filename
  88.00KiB    88.00KiB       0.00B  /home
martchus@s390zl12:~> sudo btrfs filesystem du -s /usr
     Total   Exclusive  Set shared  Filename
   3.86GiB       0.00B     3.86GiB  /usr
martchus@s390zl12:~> sudo btrfs filesystem du -s /.snapshots
     Total   Exclusive  Set shared  Filename
  40.11GiB     1.76GiB     5.49GiB  /.snapshots

Although it doesn't look as bad according to snapper:

martchus@s390zl12:~> sudo snapper list
   # | Type   | Pre # | Date                             | User | Used Space | Cleanup | Description           | Userdata     
-----+--------+-------+----------------------------------+------+------------+---------+-----------------------+--------------
  0  | single |       |                                  | root |            |         | current               |              
400* | single |       | Wed 08 May 2024 10:53:45 PM CEST | root |  29.92 MiB |         | writable copy of #391 |              
568  | pre    |       | Fri 15 Nov 2024 03:32:53 AM CET  | root |   1.16 GiB | number  | zypp(zypper)          | important=yes
569  | post   |   568 | Fri 15 Nov 2024 03:37:52 AM CET  | root |   7.55 MiB | number  |                       | important=yes
570  | pre    |       | Sun 17 Nov 2024 03:31:46 AM CET  | root |   2.69 MiB | number  | zypp(zypper)          | important=yes
571  | post   |   570 | Sun 17 Nov 2024 03:32:07 AM CET  | root | 205.95 MiB | number  |                       | important=yes
594  | pre    |       | Mon 09 Dec 2024 03:32:55 AM CET  | root | 469.26 MiB | number  | zypp(zypper)          | important=no 
595  | post   |   594 | Mon 09 Dec 2024 03:33:08 AM CET  | root |   2.02 MiB | number  |                       | important=no 
596  | pre    |       | Tue 10 Dec 2024 03:37:26 PM CET  | root | 352.00 KiB | number  | zypp(zypper)          | important=no 
597  | post   |   596 | Tue 10 Dec 2024 03:37:28 PM CET  | root | 416.00 KiB | number  |                       | important=no

I also checked all the other subvolumes but none contain a significant amount of data. So maybe the snapshots do use a lot of space but snapper doesn't show it.

Considering we're below 80 % I'll leave it at that, though. Although it would be interesting if someone could shed some light on the snapshotting situation.