Remove existing Free plan. Change Mail Plus to free plan. And create a plan in between. Not only will this complete further against Gmail and other providers, but also adds a plan between as currently do not offer anything below 500G

So new plans could then be 15G for the free plan, followed by 250G then back to current plans of 500 and up.

This is the main reason I have been hesitant in moving other the free plan does not cater for general needs and then small bump from 1GB from 15G followed by a large jump to 500G