Steps 4 - 8
Enter a description like "Escalate unassigned issues after a day"
Use the appropriate JQL to catch your old tickets like the below code block
status = "To Do"
and Assignee = "Unassigned"
and updated <-1d
Type in the user to run this script as
Enter a valid cron expression, for example to run it every weekday at 10am use: "0 00 10 ? * MON-FRI"
Then choose the appropriate Action (this is likely to be a new Status of "Escalated") and save your escalation