changing the website connected to my URL

Site URL: https://www.ankaraexperince.com

Hi,

I created a first website for my wife's small business (ankaraexperience.com).  Having no experience with this, I just sort of yeeted out something to get me started.  Now, I have a bit of an idea what I actually want my site to look like, so I created a copy of my published site, and made changes to that.  Now, I would like to publish that new site under my old url.

But, I can't figure out how to do this.  It doesn't appear that I can copy pages from one site into another.  What is the process to do this?  Also, the new site has the word (copy) at the end of it (because I copied the website), but I can't figure out how to remove this.

Thanks!

  -- Nehir