Sure thing, admittedly when you incorporate Denoise/Sharpen A.I., you don't have to do half of the cleaning up stuff I showed in the guide because it gives even cleaner/sharper results as expected by their names.
I've still yet to make a guide for that (maybe 2-3 months down the line), but I just wanted to show what you can do with Gigapixel A.I. only, say you bought that only (and of course make use of Waifu2x because that's free).
There's also this upscaler by Icons8 that upscales similarly to how Let's Enhance.io does, but its free so that's great (if you don't mind the 3000p limit).