Hard rejection on my theme and how can i improve this

I submitted my theme and get hard reject.


And response from themeforest

Unfortunately your submission One page responsive web template isn’t
ready for ThemeForest and cannot be resubmitted as it did not meet our
minimum requirements for quality and/or Envato Market policies. In order
for submissions to be considered for sale they must be of high
aesthetic and technical quality, unique to our library and cannot be in
violation of Envato’s policies.

Regrettably the Help and Quality Teams are unable to offer a critique or feedback on your rejected submission.

Please see our Help Center for more information: https://help.market.envato.com/hc/en-us/articles/204067134

Our Review team also provided these comments:

Your item does not provide the necessary design quality for this
category. As higher quality items become available in the marketplace,
approval requirements will increase to maintain appropriate marketplace
quality.While I’d be able to provide feedback as to how to get this
approved, I can only do after it has crossed a certain threshold,
quality wise. I’m sorry to say this isn’t there yet.

  • avoidable validation issues

  • inconsistency in padding and margins

  • slider needs work

  • footer needs work

  • kind of annoying that the nav is not sticky and invisible after the first section

  • no portfolio lightbox or details

If you are going into such a competitive category with a one page template then you have to be flawless in code and design and really needs to bring something new and more original to compete and avoid saturation