In case you didn't know yet, iOS 14 lets you enter jiggle mode by holding down on any empty part of your home screen. This lets you delete apps, move apps to your App Library, add widgets, and even hide entire screens. It should also let you change your wallpaper.
For those who haven't used iOS 14 yet, here's the concept next to the current version of jiggle mode in beta 1:
Pretty subtle, but I'd love to see this be how you get to wallpaper settings instead of bundling it in the Settings app.