The best alternatives to Artful are Unsplash, Declutter, and Dynamo iOS Wallpapers. If these 3 options don't work for you, we've listed a few more alternatives below.
Dynamo wallpapers utilise automation Shortcuts to change dynamically based on your iPhones battery life, and when your phone is plugged in to charge - turning your phone into a giant battery indicator! Never run out of battery again with Dynamo.
Aqueux is a collection of ultra high-resolution dynamic wallpapers, inspired by an OS X classic — available in several wide-gamut color editions, with easy installation on macOS, and a free set available for mobile devices.