Most Fellowship pastors think that teaching adult Sunday School is just another sermon except you get others to read your scripture references for you. This is not teaching, this is still just preaching. For example, why not get off the stage and stand down on floor level with a podium. Ask questions and take answers. Teach doctrine since the bible is full of doctrine and lists. If you teach and no one learns anything upon review, go back to school and learn how to teach effectively.
Pastors must teach. If you do not know how or if your teaching isn't working get help. Watch You Tube to learn how to teach. Teaching is valuable to get sinners saved by grace into Heaven. It is profitable.
"And He gave some, apostles; and some, prophets; and some, evangelists; and some, pastors and teachers." Eph. 4:11
We have pastors in our Fellowship. Our evangelists we call missionaries (I guess). We have no apostles or prophets at all. In discipleship we have gone from creating pastors out of converts to making sure the couple follows our pattern of outreach and evangelism. A good Bible teacher would teach on these ministry gifts and explain them to us. And they would know why we have pastors but no apostles. They would know why pastors teach as well as preach.
Take the word office off of the door, and replace it with Study. Study to show yourself approved.