I have much admiration for you Mimosa and I wish you every success. (the illustrations are lovely).
I searched "advice from writers about marketing digital books" and quite a few results came up. Some of them may be useful to you (I would tend to avoid any that look like they're businesses trying to get your custom).
Last three letters contd. November 2015
My blood pressure is 152/94 and I don't know what to do
Andy Burnham illustrates how much he cares about Homelessness
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