reuse a time capsule
Recently bought a new router to replace an older (2014) Airport Time Capsule (ATC). After a month of frustration with the new router, I've decided to ditch the new router and go back to using the Airport Time Capsule (at least temporarily). I'm just not sure of the procedure for doing this. Do I reset the Time Capsule to factory setting and set up a fresh new netowrk? Or do I hook up the ATC and use the old settings (which, presumably the ATC has retained)?
My devices are: MB Air, iPad, iPhones (XR & 7) and Apple TV. MB Air is running Catalina (10.15.7), iPhones and iPad are running 14.4.
Thanks for any advice anyone can give me.