Hello @Chris Roughsedge ,
The Microsoft Graph API throttling limits cannot be changed as of now. It can neither be decreased or increased as per the update from Engineering . We have a detailed throttling guidance for Microsoft Graph and a detailed article describing how to use calling patterns in onedrive scenarios for checking on files and avoid throttling which would give you more clarity on how you should design the calling pattern for your application to keep the number of calls optimal within the range so that the application does not get throttled by the service. Along with this , I would also suggest you to go through the discussion on the Github MS graph repo for the same which might give you ideas around this subject .
Hope this helps. Should you have any further query or I have misunderstood your question , please do reply in comments with details . In case the information provided is helpful , please do accept this post as answer which will help others searching similar questions in the community .