How do I clear up events to remove this message?

Hi @quintinpar 

Amplitude will warn you when you are getting close to event type, event property, or user property instrumentation limits via this message. Usually the orange warning bar will appear at the top of the page when you are within 10% of the limit.

You can read the following docs to see the best applicable methods of getting under the limits

https://help.amplitude.com/hc/en-us/articles/360059279291-FAQ-The-difference-between-hiding-blocking-and-deleting-an-event-or-property

https://help.amplitude.com/hc/en-us/articles/16805784778907-Remove-invalid-or-incorrect-data