Hi Resident,
As MSDN atricle specified, "In a 24-hour period, a single workflow instance can generate up to 5,000 outbound requests. After 5,000 outbound requests are generated in a 24-hour period, the workflow is suspended by the Workflow service."
And as the environment is SharePoint Online, so we can't change the limitation manually.
It is recommended that we can resume the suspended workflow instance by clicking Resume for the workflow.
For more detailed information, please refer:
SharePoint 2013 workflow throttling and performance in SharePoint Online and Project Online
Thanks
Best Regards
TechNet Community Support
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