I use an LTE modem and put a cell phone sim card in it. The cell phone has an unlimited plan which is cheaper than hotspot plans.
The following site has some good information on those devices.
https://ltefix.com/I also have two external antennas mounted on the roof of my camper which increases the signal.
If you know you're going to be stationary for months it might make sense to sign up with
Starlink One other tip. It's a good idea to use an ad scrubber like Pi-hole and/or a custom hosts file(
https://someonewhocares.org/hosts/) to keep from downloading ads, many of which are video these days.