problem migrating to Google Workspace

Hi there. I set up a transfer to Google workspace for my email mark@e-h-g.com. Initially, all emails to every other user at my domain stopped so I deleted my username on Google workspace, then tried to reinstate my email at Roundcube. Atlthough i used the same address (mark@), I think that maybe i have created a fresh email which has left all my unsaved old emails missing and only shows emails received since relisting it on rouncube. Can you help please?