I just wanted to share a script that I wrote to update multiple feature services that you have published to ArcGIS Online. I took the ESRI script found here and modified GitHub - arcpy/update-hosted-feature-service: Update and overwrite a hosted feature service on ArcGIS.com this was a great script to start from, however it only updates one feature service. The script I wrote creates a list of .ini files found in a common folder used to update feature services, then iterates through them to update each feature services.
Feel free to grab the code I wrote here GitHub - ChristopherLongVT/update-hosted-feature-service: Update and overwrite a hosted feature service on ArcGIS.com and make it better!
Thanks, and feel free to shoot me any questions.