Generally, if your submitted item got hard rejected by ThemeForest reviewer you can’t re-submit it again into the Envato marketplace. You may re-submit the rejected item once you have done significant changes and can be deliberated as a completely new item that is fully distinctive from the first uploaded one. So, it looks and feels like a new Item. Then you can submit it with a new title.
It’s also possible to submit with the previous name but have to mention that you have done significant changes to the item.