@T-Hoodie I noticed the same problem. So, as a fulltime programmer, I thought: Why not let the computer deal with this issue?
And it turns out that there is indeed a project which tries to solve that "low resolution when upscaling" problem in realtime! It's called Anime4k https://github.com/bloc97/Anime4K
Here is a screenshot of it. https://imgur.com/a/iLdLiDs Do note that this does not use the latest and greatest version of Anime4k.
right: a screenshot from the game
left: an Anime4k upscaled version of it, I used this site to quickly test it out https://anpuli.github.io/Anime4K-ML/web/index-demo.html
It does become slightly blurry, but that might be an acceptable trade-off. Maybe the blurriness could be reduced a bit more by tweaking with the parameters. Or by using the latest version, since Anime4k got yet another overhaul recently.
If you're interested in implementing this, this is the sort of stuff should be doable pretty darn easily as a Unity Post Processing Shader.
(Throwaway account for reasons - feel free to reach out to me, I guess)