As a new user, which doesn't really know which plan to get, I would love to have a usage estimation based on my searches/day so I can either calculate it by myself or get a suitable plan directly recommended based on that information 🙂
You can implement this on either the Billing page, directly over the "Upgrade"-Button.
It doesn't have to be a huge space. This totally fits in one or two lines of text like:
Based on your usage per day, we recommend you the {planName}-Plan!
You made an average of 15 searches per day.