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Because you're using your own lat/long data you have "points" - as in the exact point of the data.
To use a filled map you'll need a polygon, so maybe State or County ?
You will need to add that to your data. Tableau understands States, so if you had a State field and a value for each point then you could use a filled map.
If you want smaller polygons, you might have to add a polygon file as well so Tableau understands that.