Use "My Pages" instead. The functionality is a little bit limited but it won't interfere with what you're doing. The only thing you might find missing is the ability to link to another page. But that's okay. It's not on the test or anything.
Use Classic dashboards. Not the best idea, but perfectly acceptable.
Figure out who the tenant administrator is and have them make you a page builder. All they have to do is pull up your ID and open up your profile and assign the page builder role.