Advice for Sub-brands Logos design

Graphic Design
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#1

Hi guys,
I should design 7 logos which are sub-brands of a main brand named CCY that is an abbreviation for the word “Currency”. Sub-brands include CCY Academy, CCY Market, CCY Fund ,etc. Can you suggest me any concept or idea?

#2

My own concept is shown below. but the results aren’t my taste yet.

CCY_SubLogos_04-2
CCY_SubLogos_04-22321×2889 152 KB

#3

Have a mark or monogram that remains consistent across all logos and change the type for the sub-brands.

#4

Thank you dear Steve!

#5