I think there are 1 or 2 lines on the 74&MD that have something like 12 on 16 off per a 28 day window. Reserve recovery lines are another option to get full guarantee pay with reduced duty commitments. Otherwise, if you are looking for that delta 9/21 club thing, it doesn't exist here. Some of the domestic fleet's lines can get into a 4.5 on 8.5 off deal if you live in that particular outstation (gateway) and can also hold the night sort 7/7 lines to that same city: eg. show Mon night at PHL then fly nite sort out and backs to phl until Sat 5 am ending in phl, with a positional DH on both ends.

You could drop (trip transfer) into less working days but it comes with a pay reduction.

You could conflict bid to get more paid time off...If you are senior.