You could:

Buffer points - it looks like your points are fairly uniformly spaced, so buffer by their spacing (radius + 1 metre) so they overlap with their neighbour.

Dissolve resulting buffer points, specifying your "abk" field. This will create a separate multipart polygon for each "abk" code.

Set up the labelling to label each multipart, and set symbology to "no symbology" and you will have something like the below.

Might need to play around with it a bit but hopefully should get you there.
Final points grid