404 error, can't view the sub-pages.

Hi Again,
I have just had approved an old comment on a sub-page(?) under this parent page and went to view the page and it was not there, just a 404 error page. None of the links are working on this page, all other main pages are fine.

I recently had my hosting provider change the domain name so am wondering if this is the problem? It was https://www.homeschoolheavenaustralia.com/blog (to get to the first page of the wordpress blog) and I had them change it to https://www.homeschoolheavenaustralia.com/home.

Thanks for your time
Turina