I'm sure you're aware of this, but bringing it up in case you aren't. On newer Face ID models, you can swipe down on the bottom of the screen (the little grey bar) and it'll toggle the reachability feature so the top of the screen comes into the middle of the display. Basically shoving everything down.
I understand it's not ideal, but I find it a valuable feature when I must operate one handed and sometimes struggle with the same issue.