Part time...part time...part time!
Not a huge amount of options at my airline but I'd guess BA has quite a few choices that are more complex than the 50% or 75% available to me.
I'm 75% which is 5 on/5 off - find something else away from aviation, a new passion with all your new time, involve the wife and family. Something genuinely for yourself and your own satisfaction.
Then just go flying, as nothing more than something to do between your days off!