Upgrade Your Cell Plan
Now this one seems a bit too obvious, but it’s still worth mentioning.
If you feel like your data plan doesn’t offer enough value, you should definitely consider upgrading it. You don’t have to go for the most expensive one, but you can always try to get one that fits your budget and gives you more data. In fact, it’s worth keeping an eye on what plans your carrier offers as some introduce newer plans with more data at the same prices, but they won’t automatically move you to those new plans unless you ask.
If your carrier doesn’t have what you’re looking for, there are plenty of other iPhone carriers in the US that will give you a bang for your buck.