Well...
For one thing, there's no magical formula to be able to tell for sure what people will or won't be interested in. Sometimes people may just not be interested, and you can't take that personally if that's the case. Just have to try something else.
Also, if you don't mind me being honest, your spelling and grammar can be a little difficult to understand sometimes. While that may be fine for posts across the forum, the Serious RP section is often held to a higher standard in that respect... meaning that posts in that board should appear as you'd see them in a book. Of course, that's not always how it ends up working out with everyone in the Serious RP section, but it can sometimes come across as looking less "formal" than Serious RPs are meant to be.