My issue is large ankles & calves. I'm not horribly overweight but seem to have been bequeathed with my aunt's type of legs... which means large ankles & calves. I don't want to move from a bike specific boot but I'm seeing that I may not have a choice. The Oxtar Matrix boots that I have right now have never fit right & have never zipped all the way up the side. Every single boot that I've tried on is too small around my ankles & calves. I may be trying the tactical type boots myself out of frustration of not ever fitting cycle specific boots.
(I'd rather have cycle specific boots)
Sadly, the answer to that is going to be more expensive. Many of the ADV style boots have no zippers, but two/three buckles and a large velcro flap. These accommodate larger calves more easily, though large ankles, I really don't know. Much more adjustable than the average street touring boot.
Alpinestar, Daytona and some of the Sidi boots have good reviews for large ankle/calves. The Sidi Vertigo has adjustable calf areas, for example -
https://www.revzilla.com/product/sidi-vertigo-boots