Hello, i understand how frustrating it can be to have a rejected theme. Iam trying to be an author too as I uploaded my first item last week and still waiting for review. So my advice will be as short as my theme selling experience is.
Build solid design skills that match the market standard. Your theme actually lacks a lot of design polishing (unbalanced colors, bad typography, logos and imagery.
if you build a responsive theme, make it responsive and eliminate layout issues like I saw on my phone (mobile logo far too big)
gather lots of inspiration but don’t copy others work.
If you want, you can check my first submission (still waiting for review). I absolutely don’t have a clue about wether it will be rejected or not, but what I know is that I’ve put a lot of design effort into it.
My first item wich is currently in review process
Hope it helps.
EDIT: there is also a big issue on desktop in your theme, when you try to scroll to the copyright section of the footer, everything jumps. Seems like there is a glitch there.