Hi thank you for the follow. I followed you back.
I might have an idea for your question. It may help I hope it does.

I would say in one of the lessons its best to keep the page names the same because it will mess around with your google ranking.

As for the domain name I don't think you can change it but your website names you can. I would just keep that one and do a new one.

Why not have Two see which one you like best but you can also use that website u don't like the name of and use its best page interact with that website and its well you get I would say a Double wammy.

If you get my jist. :)

If you wanted to change domains you would just have to use the "move" option on your current domains. After the website is moved to the new domain the old domain content is redirected to their equivalent page on the new domain. You can leave this redirect there indefinitely(for as long as you register the domain) or you can delete it after 30 days(recommended amount of time. This gives the search engines enough time to update their indexes with the new location of your content.

The only thing you would lose are any links to your website that were shared by other people on social media or posted on forums, etc. Those links would still reference the old domain and essentially be orphaned after you deleted the redirect. This is unavoidable, but if you think a new domain would be better instead of your current one, I say go for it.