Currently, cartographers are only found in villages and they never leave. This is very weird, I mean after all they should be out in the world, making maps of a variety of locations. That is why I suggest adding cartographer tents.
These tents should spawn around the world in most biome. Inside the tent will be a bed, a chest (full of random loot that the cartographer might have collected on his/her journey) and a cartographer table. On the outside, there will also be a fence and gate that block the two entry points which protect the villager at night, as well as a few torches too. A cartographer will also spawn inside these tents and will trade new maps which can lead to different structures (for example, a map which leads to a jungle temple) and also all normal cartographer trades. The tents will be made out of wool and planks/slabs/stairs/fence which will vary depending on the biome.
Occasionally, a small garden will also spawn next to the tent, containing a few crops.
Here are a few images of what it could look like: 

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