Do I need Clients or a client portal for my own business?

No. Add your own business websites without client records. Settings → General → Client work → I manage websites for clients shows optional Clients/Prospects menus and client choices. New workspaces start with client work hidden; existing workspaces with client or portal history are kept enabled conservatively. Hide client work only changes presentation: it does not delete clients, detach websites, revoke portal access, cancel invitations or stop reports/reviews. Plan limits and permissions stay the same. See Invite an SEO specialist when you want help with your own website.