alt Hacker NewsData point: I'm in the US on an old pre-paid plan that gets me 5GB per month at fast speed, dropping down to unlimited "2G" speed after that cap is hit, which I've done only twice in the past 12 years. $30 per month, and I always "bring my own device" (ie, I only buy unlocked phones, not through the carrier). I haven't shopped around for a while.
You should shop around! Some of the MVNOs are offering unlimited fast data at a similar price these days, and something similar to what you have now for cheaper.