I appreciate the work, but as one of the active member of the charity for the one you made for this logo, I guess you need to enhance your skills regarding the work as I see it as not visual or remarkable.
You might need to consider that the charity is bitcoin related so it should have been related to that, as for charity symbols and font selection also matters.
Anyway, seems I sound demanding for a free offer but you can keep it as idea for your future clients and offers. Cheer up.