This seems to be a common problem on all leather boots with either no rand at all or a low rand such as a that used on lot of the Altberg boots.
If you're not too bothered about how they look have a look online for either McNett Freesole or Shoe Goo (there are other similar flexible products available). Both can be used in a number of ways for footwear repairs including creating/building a false toe cap to protect the leather at the front of the boot.
NB This will not look pretty when finished but it will reduce/prevent further damage. The procedure is to tape across the toecap area from just below the bottom D rings then sand and clean the leather with Isopropyl alcohol to remove as much wax in that area and provide a surface which the McNett Freesole or Shoe Goo can bond/key to.
There are videos on YouTube and elsewhere for both products showing how they can be used - one of which is to create a protective toe cap.
https://www.backpacker.com/videos-photos/fix-it-make-a-protective-boot-toe-caphttps://www.youtube.com/watch?v=y8s_ZdqmmrkBefore you make a decision if your boots are anywhere near needing a resole another option you may wish to consider is to have an extra high rand fitted at the same time as the resole for an extra charge of £20.
https://www.altberg.co.uk/boot-fitting/resoling