When I was trying to add our plugin to CodeCanyon it was rejected and support told me to create a topic here to get feedback from You guys.
One main thing our plugin is free to use but it can not be free so we add the lowest price for it.
I will add GitHub link which plugin we were trying to add the link below: https://github.com/SpectroCoin/WordPress-WooCommerce-Bitcoin-Payment-Gateway-Plugin
also, we add a link to video tutorial and screenshots how to setup the plugin, but still it was rejected.
Maybe You will give us a hint what we were doing wrong.