The best alternatives to iconOS are iOS Icons, GLYPHICONS, and Ultimate Icon Pack. If these 3 options don't work for you, we've listed a few more alternatives below.
This set includes replacement icons inicns andjpg format covering 250+ applications in 2 different styles. It's optimized for MacOS Big Sur and iOS 14.
Flpapers is an art-platform to download personalized wallpapers in HD. Flpapers have unique wallpapers that can be personalized with your own words and downloaded for free in HD.