Game becomes blur when tilemap becomes bigger


My current tilemap is about 5k x 5k. I have a few cameras working, the images displayed by the tilemap camera blurs out a little while other contents are pixel perfect. What setting am I supposed to tweak about?

Will the same issue occur for other type of layer?

Edit: sorry, not tilemap, it's a tilemap but it is in .png. I put it in the background layer.
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A 5k*5k image would not fit to a texture page, their default size is 2048*2048 (can be set larger), it would get scaled to fit which would cause issues with image quality. Chopping into parts and importing those was the correct decision.