Personally, I was discipled by attending church 4-5 times every Sunday for worship, teaching, and prayer, door evangelism on Tuesday, bible study and prayer on Thursday, youth bible study on Friday, and evangelism on Saturday. I lived and breathed the local church, sitting under doctrinal teaching, listening to mature believers pray, and working with mature believers in evangelism.
In my opinion you’re not serious about discipleship if you go to church once or twice a week. Find a church where bible study is thorough, prayer is regular, attend at every opportunity.
One-to-one discipleship has it’s place, but most of the lack in Christians is due to neglect of good teaching and corporate prayer.