The issue isn’t a big deal for the average user. The vulnerability required them to first get your username and password, physically steal your Yubikey, spend half a day using $10-15k worth of electronics equipment to repeatedly authenticate over and over, they then could potentially make a clone of the key.
Another recommendation for Proton Mail. As others have said I’d recommend getting your own domain for email so you can always migrate providers without having to change your email address.