New Installation

Hi, following many hacks, and after years the website becom slowest.

I would like to make it new to make it clean :

If I create a folder in my server (online, desactiving tracking first. Without deleting the original site for the moment, to take the things I want to save. But activing in the new : plugins, rewrite the posts, put pictures…)
when then I will put the folders in the base of the server (increasing the older), the url will follow, or will I have to change some thing ?

Thank you for answers.

PS : I know i can make it first on a localhost server, but i have problems with wamp, website dont want to import files extracted from the actual website. Time exeded problem and changing php.ini don’t resolve, i would try online in a new folder)

Good evening