In what order do Actions, Webhooks, and Automations fire?

I have several instances where I use an Action to write a new record in a "history" table when certain fields are modified, and the history record includes the User who made the change.  To do this, I write [Last Modified By] from the parent record to [Changed By] on the history record.  The problem is that sometimes other Actions, Webhooks, or Automations also change the parent record, so by the time the history record is written, [Last Modified By] has been changed to the admin account used to create whichever Action/Webhook/Automation fired immediately before.  I assume there's no way to control the order among all three kinds of workflow, but within each set is there a way to control the order?  Do they fire in order by name, or the date/time they were created?  If not, can you please suggest ways to make sure a certain Action knows which user made the change so that the history record is accurate?