Advice for Sub-brands Logos design

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?

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

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

Thank you dear Steve!

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