The S/O life looks pretty good to me with lots of days off. Why rush into the F/O short(er) haul flying? You'll just end up complaining about the roster.
If seniority determines skipper, then why not just enjoy your free time? I'll take bypass pay and more days off!
Some S/O's are upgrading to F/O after only 2 years 8 months, not a long wait if you ask me.