Hello, i saw you said you wanted some pointers for your new book. I'm no professional or expert and sometimes i wonder how and why people read my books but from what I know, you have to give your characters a back story to make it good especially your main leads. So for your new book, you've got to explore why your fl likes your ml. Is he hot, smart or did he save her from bullies etc. But to make it spicier, it would be better if the ml liked the FL but didn't know it yet or he knows it bit doesn't know how to express it very well.
That's all i can say to motivate a new fellow writer but as for me, i write for for fun and don't stress myself if i get negative comments as I am always learning. Thank you