SPO Site restructuring approach

Hi

We are trying to restructure a publishing site with 5 subsites to 2 subsites in such a way that 3 of the sub site should be moved to another sub site. 

based on an article we have used sitemanager.aspx by manually creating the url since the default feature no longer available.

but still move will not happen instead error (we are doing the activity as a site collection admins).

any OOTB feature to do the restructuring in SPO?