I did not properly transfer my domain…
I did not properly transfer my domain name ownership from my former host SquareSpace to Webstarts. Once my SquareSpace account expired, my new Webstarts website went offline. Webstarts tech support was sympathetic and patient as they explained my options. On Webstarts' advice l found the solution on the SquareSpace help center page, where l learned l could still transfer my domain name even with my account expired. Once l got my authorization code from SquareSpace, Webstarts got my webpage back online almost immediately.