As @G4Q4 has suggested, what has likely happened here is you have fully consumed your “burst” rate limit which is very large (especially on Ultra), but also very slow to refill. Just to state, the “burst” rate limit is always >= your plan amount - if you have consumed all of this, this signifies you have used at least $200 worth of usage so far.
This unfortunately then limits you to only use your “local” rate limits, which is much smaller but resets fully every few hours.
As @IsaacHopkinson has mentioned, your usage so far has been highly exceptional for what we would see, even from the top 0.1% of users. For context, your usage equates to one request every ~90seconds, 24 hours a day, since the new plan started.
This does suggest some kind of automated user / shared use between multiple people - both of which are neither supported nor allowed in our terms and conditions.
If you have any more info on how you have used this volume of requests, we can maybe provide some support on how best to move forward!