Amazing idea

Your novel is very creative and evolution and I like it you are so talent

Such a strong concept! You had me for the first two lines, and then it turned too cryptic. "silver moon is rising" isn't definitive enough, so I would suggest completing the equation of Protective Billiionaire + Murderous Sister - where will their big battle be? How will they fight (i.e. physically, mentally, emotionally, financially, etc.)? "The throne was stolen, but the revenge will be eternal" - okay, you can kind of get away with this as an end tagline, but I would consider using the SYNOPSIS section to write out the basic premise of your story, as if the blurb on the back of your book, so that we get all of these little details. This should include WORLD (like why is him being a Billionaire important?), MC's Strength & Flaw (we don't know either from your current description), MC's Want & Need (I can only assume she wants revenge but needs to get her throne back? If that's true, consider highlighting a secondary relationship - I'm assuming there is a romantic one with the Billionaire - so she has something to fight FOR not just fight AGAINST), and STAKES (universally we get it, but with what you have, we don't know WHO is more important to her, so we don't know what is PERSONALLY at stake - and personal stakes are always the most compelling).