Duplicate website to go online

Hello,

I am doing a major redesign on my website so I have created a duplicate to be able to work without any issues. A lot of my pages have been redone, so I have duplicated also URLs and such in the new version.

I understand that I can transfer the plan and therefore the domain onto the new design in WixStudio. As most URLs remain the same, I am guessing this will not affect SEO?

However before doing so, I want to make sure I will not be having any other issues, such as traffic loss, sitemap and such. Has anyone done something similar and can provide some feedback?

Thanks in advance