Did you expand the filesystem itself?

You go from physical (your dd) to encrypted (luks) to lvm(if used) to your filesytem itself.

You probably have btrfs so check out Resizing btrfs

Edit: I can read, you have ext4 :)

Check out resize2fs, IIRC it can do it live on a mounted partition

This is why we require second factor on the password manager too, otherwise you’re exactly right.