This deck is really a mix of much things, no offence me too.
First of all, you use Sea Diva with only 1 sea serpent, and he is lvl 3 AND you don't have any synchro lvl 5 in your deck, si that's bad. You use Gravekeeper Descendant with only 4 gravekeeper and WITHOUT Recruiter, that's bad too. You have too much monsters, really too much, and that's bad.
In final, you mix all this... that's REALLY bad (sorry for this, I just give my opinion on it)