Try uandishi something wewe come up with. I have written many vitabu based on experiences and dreams that I have. Sometimes I don’t even pay attention, I just wake up some mornings and think wow, what a twisted dream, I think I should write it down.
It sounds like wewe are trying way to hard. Write for fun, write about anything wewe want. uandishi is a great way to express your feelings. Don’t just write about Wanyonya damu because Stephanie Meyer wrote about vampires, and her book became a best seller. If every mwandishi wrote about Wanyonya damu just because Stephanie Meyer’s vitabu became a best seller, then people would get bored of vampires, and not read your book