Yibai's current responsibilities, strictly speaking, are only two.
The first is to defend the Northern State.
The second is to support the righteous and expel evil, so the mortal realm doesn't become overrun with malevolent energies.
However, responsibilities aside, there are other matters he must attend to, such as the recent disaster in the mortal realm.
Then there's the upcoming Heavenly Lord banquet he must attend, as well as his own cultivation, not to mention his concerns about the Red Moon World.
Right, his treasure is still being refined at Laojun's place.
He still hasn't made any headway in investigating the matter of Ancient Shu in the mortal realm.
A whole host of issues lined up one after another.
Yibai daren't imagine what it would be like if he had twelve or thirteen responsibilities; what he would become.
It's no wonder he could never find his master when he visited the Netherworld; it turns out it was this way all along.