I found this on Flightsim.to, initially I was a little sceptical because I didn't want to use anything that might change or upset the sim but it's a little piece of script that runs outside of MSFS. If you don't like it you can just not run it or delete it, it alters nothing in the sim itself.
What it does is replace the Bing maps with Google Earth maps which are far more up to date and better resolution also the colour's look far better in my opinion.
MSFS 2020 Google Map replacement » Microsoft Flight Simulator
One important thing is to clear your cache in the sim otherwise you might get a problem with the scenery's clashing in the distance (I know because I forgot to do it initially)
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