Identify your target reader
A friend of ours always used to ask 3 deceptively simple questions when evaluating the market potential of any book:
1) What’s it about?
2) Who is it written for? And,
3) What will they take away from it?
Authors are often clear on the “what”, but not so much the “who”.
Perhaps you think, “My book will appeal to men/women of all ages and could be read by anyone…”.
It won’t!
Or, “It’s aimed at young people, but could be read by adults too…”.
Not necessarily, unless you’re J.K. Rowling.
Aim to keep your target reader in mind at every stage of the publishing process, from writing to editing to cover design.