Make basic mail an option
Make basic mail an option that can be set so users don't have to switch to it every time they refuse to turn off their ad blocker. As long as you are going to use intrusive advertisments with scripts and trackers I and other users will continue to use an ad blocker. You even bombard your paid users with ads, it is well known and for that reason I wont go that route either. If you went back to basic hyper linked graphic banners for advertisement there would be no issue with ad blockers at all. People value their privacy far more than the lack luster service you provide, all of the changes you have made over the past few years have been change for the sake of change with little to no improvement. I have used the same Email for over 20 years and its enough to make me want to change.