Just a couple tips to help improve the demo at least: on the main lading page your link to your Blog Demo is broken, and your sample demos appear to be heavily inspired by the main Newspaper theme demo (https://demo.tagdiv.com/newspaper/). So perhaps some more aesthetic tweaks unique to your theme could help.
And if the reviewer gave you any reasons (we don’t submit new items all that often, but I think they usually write at least one reason) definitely start there. And be sure to have a look at the new WordPress theme requirements since the review team is likely already taking these into consideration.
Best of luck! 