Hi @Lerwin_Tan,
I can confirm that your Max Tier Threshold is currently set to Tier 4, which has a limit of 50 requests per minute.
You can check detailed analytics on your API calls by going to Manage → Analytics → API Calls in the console.
I can see that the highest number of calls come from the Data Service (specifically, the Create operation), which suggests that your application is actively creating records in the database.
Regarding the Local Storage message, please take a look at this topic: Local Storage is Full
Regards,
Viktor