@cmishou74 With the motivation thing it depends on overall mood, usually when I get the motivation to do something I work, keeping that motivation is very hard and I'm not too sure on this question myself, being in a good mood with an inspiration is probably a good guess on keeping motivation.
And
Personally, what people look for in books isn't really something I know myself, usually I write what I want to write because it suits me better, I think good Grammer, an easily read format of paragraphs and good plot is something they look for, I recommend looking at successfully published books IRL for example, like Harry Potter or Percy Jackson.
I'm not good at advice unfortunately