How did you manage to copy all of your Google emails across? I have 34k emails over many years and I can only see the last 12 months only when viewing via Apple Mail on MacOS. I have to go into Gmail’s interface if I want to see them all.I just did this move recently because of this exact reason. Created 2 folders in iCloud, one for Inbox and one for Sent, on a Mac copied all Google emails to these two folders. Made the MX record change and removed my Workplace Free subscription. Really easy. I have all my old emails in iCloud and I am using my custom domain with no issue.