Please try to migrate your site with this free plugin: All in one WP migrate, you would not have any problems. Our theme does not influence the migration process.
I tried With All in one Migration Plugin Everything Is working Fine EXCEPT about us page My Old About Us Page IS Not Opening Only Logo is Showing So I delete My About us Page And I Import it from the theme Still its not opening and showing an error you can see in the screenshot.
and When I Import About us 2 its working properly only the issue is coming in about us page
I am Providing you Admin credentials Please Check and Fix If there any issue With Theme.
Please deactivate all the plugins not related to the theme and switch the parent theme, check the issue, If the problem has gone, activate the plugins one by one, checking the issue to detect which one causes the problem.