What's wrong with Google Workspace?
I ran Office 365 for a year, this was pretty good but I got fed up of having separate email clients.
I used to use POP3 and IMAP for emails with Gmail picking them up. This caused a few issues with emails being marked incorrectly as spam so I ended up moving to a better solution. For the sake of a few $ / month it's a no brainer to use Google Workspace for me these days.