I had a wordpress site with a domain, lets call it example.com, hosted on siteground. I wanted to remake the site so i made a new one with a temporary domain. I then changed the old sites primary domain to the new sites temporary domain, and the new sites primary domain to the old sites example.com domain. Was this okay to do?

I then realized when searching for the site, only the old subsites for example example.com/about came up even though i dont have an about page anymore. Will these go away in a few days automatically?

I then checked my google search console and saw that there were many indexed sites such as example.com/top-10-freelance-blogs, these are probably because of the theme i have used. I can not see these in my google search so it doesnt really bother me, the urls don lead to a site either. Should i somehow clean this list up and only allow my home page and my two subpages?.

Any other tips you have in a situation like this are apprechiated! Thanks