Seminaries do not recruit students. Churches do. Pastors do. Sunday school teachers do. Synods and districts do.
Back when dinosaurs roamed the earth, every Synod had a “church vocations committee“ whose job was to present young people with the opportunities where they might serve in full-time ministry, whether as Pastor, Christian education specialist or missionary.
Also, vibrant youth groups, such as Luther League did the same.
The question of whether I might consider whether I had a call to ordained ministry came to me through Luther league, through my pastors, and through my synod. Then, those same agencies helped assess whether I had the proper skills or aptitudes for one seeking ordination.
Of course, in those days, no one had to wonder whether there would be a church available for them to serve following their graduation and ordination. We had more “potential job security“ than almost anyone else in graduate study.