I know that feel. Bone Zone is a delight to play but my friends are brainlets who can't figure out how to counter my skeletons even they though play top tier armies. So anyway I wouldn't get a second brick. Deathmarch is also pointless to take. One thing I'm doing is maintaining my core of a 1k pure Bone and then building around it. Adding in Necromancers, Nighthaunt, Mortarchs, Vampires, etc.
If you haven't, bump up your Grave Guard. They aren't as good as Grimghast Reapers but they still do some good work. I currently run 20 and get no complaints about them from my group, despite the fact they're capable of destroying a lot of units in one turn.