"...I find myself having no medium to long term objectives beyond retaining gainful employment..."

This is the crux of the issue, IMHO. Many people have objectives beyond retaining a paycheck, and thus conniving and office politics were born. I suspect you could be very good at diabolical Machiavellian manipulation were it forthright and inspired by real goals. That doesn't seem likely for you, however. You have sound values that would get in the way.

There are other inspirational motivations that could obliterate the ennui, though, even merely adjacent to gainful slogging. It is true that if the why is big enough we can endure any how, and that endurance can become a thrill ride as each soul crushing feat of endurance is surmounted for aspirational reasons. I hope you can rejigger psychologically to yearn for the daily grind, so that you do not suffer your good fortune, but reckon it a joyous quest you get to daily advance. That seems to be your primary challenge presently.

Thanks!

Edit: I forgot about 4 tens. I dunno if it's potential to you, but going from 5 eight hour days to 4 ten hour days can alter the deal. Folks can even pray to alter it further by attempting 3 ~13 hour days. This can open up relief valves and enable side quests that improve morale IME.