Highest turnover is probably in the call centers. If your call center personnel have good morale, you probably need to replace the local management.
A lot of airlines have been outsourcing their maintenance. There’s a big fight over at Southwest about that now. But A&E certification would probably be a marketable skill.
I'll bet they'd outsource breathing if it could get them out of some of the paralyzing union contracts. Always keep the oldest flight attendants on the job ... yeah, that's the ticket!