Why do you write? If it's to become the next JK Rowling, Steven King or Sophie Kinsella, you need to step away from the keyboard or put down the pen and paper. I'm not saying it's not possible, but writing fiction simply to become rich and famous will never produce a book with that sort of potential. In my opinion, you need to write your story because you love it.
You don't have to love everything about it, but there has to be some facet that fascinates you. Maybe it's a particular character or an incredibly complex puzzle of clues. Maybe it's the setting or the prospect of writing a story where true love really does conquer all. There has to be that one little bit that gets you coming back to your keyboard. How can you expect readers to get excited or interested in a plot or characters that leave you cold?
Back when I was directing theatre, I quickly discovered that I couldn't direct a play I didn't care about. Why would I put all that effort and time into something that I wouldn't walk across the road to see? There always had to be something; even if it was only one speech in the second act, that made me think "This is worth it."
Writing takes time. A long time. You're going to spend months with these characters as they travel through your plot. Why would you spend that much time with characters or a story you don't love? Loving my characters makes me want to write them well. I want my readers to share their sorror in tragedy or rejoice with them in triumph.
Forget 'what's hot right now' because by the time you're finished writing and editing the odds are it won't be hot any more. Write what moves you. Write what makes you laugh. Write what makes you dream of a better world. Write what you love.