The document @ww posted says it all, but in summary, there is a limit to the number of API calls you can make per minute. This is to protect both the Meraki systems and to give everyone a fair-go. There is no way of increasing your limit.
You’ll need to look at your script and see if there is a more optimal way of achieving your outcome. For example, rather than polling each device, use an API endpoint that provides a summary response for multiple devices, then drill down if needed. Or implement webhooks to get an alert about a device, rather than continually polling