Flow Failing Between Sharepoint and Excel

Hello all, I'm running into the following problem when running a flow that tracks daily check-in and check-out times for 250+ employees in an Excel workbook. The employees have differing schedules due to time zones, but there are definitely some peak times where we have noticed the most issues.

We received a notice about 1 week ago that our processing limit (API calls per hour maybe?) was being reached and the flow was being throttled, but we have not received the same notification since. Additionally, there was no data missing from that day or the few days following it.

Everything ran fine at first, but in the last 2 days we have seen an increasing number of BadGateway, 429, and GatewayTimeout errors. These have all come at the "add a row in a table" step of the flow, and the data is no longer consistently pulling into Excel. Today, we also noticed some form responses not appearing in the Sharepoint list shown in Step 5 of the flow.

After searching some of the other posts on this site, we implemented the 'delay' step shown below and limited the concurrent processing of the flow, which seemed to help for a while, but our errors are starting to increase again. We have also set the Excel workbook to manual recalculation which has helped with the workbook's performance. Is this an issue with the connector, is the Excel table/workbook becoming too large (currently only 3600 rows of data in the table), or do we need to upgrade our PowerAutomate license/processing capability?