That might fitten up your feet, but the thinning of the fat layers in the feet will still be an issue. It happens to us all, it's just part of the way we change as we age.
The gel insoles are a very kind way to deal with that inside boots and walking shoes though.
There's something else though that we just don't talk about.
Most folks are inclined to keep their 'boots' for specific outdoor jaunts.
Just wear the blooming things, wear them out and about.
Wear them daily, walk in them, have a wee run, stand around in them, wear them on the way to work, doing the shopping, out for a dawdle, cutting the grass......and you'll get used to them, they'll move enough over time to shape to you and your wear patterns, and by the time you need them for a 30 miler then you'll know exactly how to make them comfortable