Never say never, but the chances I will go back to sea on a cargo ship are slim to none.

The new job will be harbour tugs, and those things are certified for sea, but don't really undertake voyages. At best ferrying to any port within a 10 hr range, or single day contractors work but that is rare and not the main occupation of these tugs. 99% is mooring assistance, 5% is escorting (big tankers are required to take a number of tugs allready at the port limit and are not allowed to move without tug escort).
Three man crews, shifts of 1 week on, 1 week of, every 5 cycles a 2-week leave, for a total of 23 weeks per year on board.