In this case I’d just add an input boolean to the setup and check against it in a second condition - the input-boolean could then be changed manually.
Or, maybe an even better idea:
Set up an automation with notification every evening at 9pm with an actionable notification e.g. like this one:
The 2nd part of the automation would be to turn the next day to a workday anyway (in case it wasn’t one today).
So, if you do not respond to the message, the next day is a normal day, if you do, the input boolean will be changed to indicate a ‘free day’.