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Sorry my friend. When you have the maximum data plan we offer, you won't be able to purchase additional hotspot data separately.
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Nothing stops you from getting a second line though.
If you're regularly hitting a hotspot cap, it may be worth an investment in getting another line, depending on how much you need. If you're on a 10GB plan and hit it 2/3 of the way through the month, you'd probably only need a 5GB plan to make it through the rest of the month. You don't get the economies of a family plan, though (which may make a postpaid an option to look at).
With it being hotspot, you could just get an inexpensive phone and turn it on when it's needed.