The Salesforce connector is continuously being rescheduled because 90% of its API limit has been reached.
Salesforce connector on Fivetran's dashboard
The API limit has been addressed in our docs already.
A couple of fixes to this would be:
1) To tie different credentials to the Salesforce account you are trying to connect with Fivetran and use each of them for various applications/ connectors
2) Increasing the API limit on your end might help. The below doc link might help:
This usually happens if there are multiple connectors/ applications besides Fivetrarn making API calls to the same Salesforce account.