Speak to Duthorian Rall in Stormwind.
Hello, [player]. I see your dedication remains strong, as does your faith.
I think it is time you spoke with Duthorian Rall in Stormwind. There are some more lessons for you to learn, and I feel you are prepared.
Seek him out in the Cathedral of Light, and [player], take these lessons seriously. You've attained your status through humility and hard work, do not disappoint us by becoming arrogant.