Try লেখা something আপনি come up with. I have written many বই 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 আপনি are trying way to hard. Write for fun, write about anything আপনি want. লেখা is a great way to express your feelings. Don’t just write about ভ্যাম্পায়ার because Stephanie Meyer wrote about vampires, and her book became a best seller. If every লেখক wrote about ভ্যাম্পায়ার just because Stephanie Meyer’s বই became a best seller, then people would get bored of vampires, and not read your book