[X] Sinecure
The first possibility, of course, is that you accept the current status quo as a reward for your hard work, rather than a deficiency to be addressed. Belegar will keep finding ways to make use of your talents, and you'll have time and resources enough for your pet projects, as well as still being on hand should something go drastically wrong and need correcting.
[X] Loremaster-at-Large of Karak Eight Peaks
Or you could push Belegar to continue sending you afield. He does want to continue to enhance the stature of Karak Eight Peaks in the Karaz Ankor, and what better way to do that than for you to travel it and solve all their strangest problems? It would also mean getting to see every corner of the Dwarven world and encounter all the strangest phenomenon it would have to offer.
[X] The Waystone Project
Or you could turn to the biggest possible project you could pursue. The Laurelorn Elves have voiced their desire to work with you to unravel as many secrets as possible about the network in the slightly inaccurate belief that you already have some of those secrets. This might be the only chance to pool the knowledge of the Laurelorn, the Empire, and the Karaz Ankor, and for a project that could do wonderful things. Sure, you doubt you'll be able to replicate the combined efforts of the Elves and Dwarves at their heights, but every scrap of understanding of the existing network could make all three peoples better able to protect and make use of the ancient energy streams.
[X] Ranaldian High Priest of Kislev
Another one from Heidi, this one more directly. This is a wheel you set in motion yourself, and perhaps it's suitable that you follow it through to the end, resolve the grudge between Ranald and the Gods of Kislev, and establish the worship of your oldest friend in a new land. You did leave quite a few mysteries behind in and around Kislev that you'd quite like to get to the bottom of, and it would be fun to have the undeniable right to attend future Grand Conclaves.