I have Verizon. The “unlimited” plans are a huge scam, even if you can get your hotspot on, it’s basically unusably slow. But if you can swap over to a pre-paid plan, which is a huge pain in the ass, you’ll get ~15 GB a month for the same price and you can use it however you want. I don’t know why they make it so damn hard to use their service.
Are you sure it isn’t you using it for just one purpose??