It really depends on what your goals are, which you have not shared, so it makes it difficult for people to help you. You mentioned "exploration," -- is that your end goal? to taste all the different flavors of ACR? If that's the case, you could focus on pieces utilizing:
different fabrics (e.g. seems like you have no -CH pants)
different solutions to similar problems (e.g. what's the best pocket organization for my use-case?)
And are there things you're dissatisfied with in your current pieces? certain (social/climate) situation that a garment doesn't address (e.g. would you feel comfortable wearing what you have to a wedding? to an office? to a board meeting? to the tropics? to deep winter?).
Not that you have to cover anything and everything with ACR, but these are some questions you should ask yourself to figure out what your "needs" are, and then people will be better equipped to help.