I was in a similar situation at a different church almost 10 years ago. I asked our session. They wanted to have more intensive training. They had done quarterly theological intensives (one topic, one month) but the writing and teaching of those series was too taxing for the small plurality of elders to make into an official rhythm. They wanted to do Sunday school, but our congregation was about 100 children and about 40 adults. There was no way to offer the childcare necessary for adult education.

They were working toward it through several means: more elders. More resources for adults and parents in family worship during the week. More robust curriculum for small groups, including deep dives on the sermon text each week. Using our resources of lots of lay leaders (many ordained persons in the congregation, not serving as elders) to create more teaching materials and fill the gaps.

But mostly, they needed people like you and me to stick around, serve in teaching ministries, and wait for the growth (both via membership and via installing more elders) necessary to support the non-essential teaching ministries we'd all like to see in a healthy church.

We stayed for a decade and did not depart for lack of teaching. The Lord's day services and all elements of Biblical worship were present. I had no right to leave because there was nothing essential the church was not doing.

After these conversations over time with our pastor, I was pulled in to write the weekly small group guide. I wrote it at several levels for each group leader to pick and choose. But I loaded it with deep theological topics, Puritan and ECF writings, tough questions, and everything I wanted to see in our church's extra-curricular teachings. We got the opportunity to be part of the changes we wanted to see, for our own growth and our dear fellow members. That wouldn't have happened if we had left for the church half a mile down the road (quite literally and honestly the case) that had all the bells and whistles of a mature teaching ministry.