Legacy Premium and Plus are subject to an increase in price at the next renewal.
The truth is that this is the first increase in many years. Evernote would, in my view, have been much wiser to have an annual increase in line with inflation on all subscription prices. I don't doubt that the price would then have been more than the proposed new price.
But if the new price isn't value for a user then, of course, you move on or drop to Free.