Next time you hook up with booker(s) on a weekday, ask them if they have girls working Sundays.  In case it's not already obvious - never block your number and always use the same number.  It's generally not a problem hooking up on Sundays once you're well established, but a lot less to choose from.  Maybe you're not cleared with outfits that work on Sundays.  I seldom text and I call early.