Start praying for vocations now
Create a parish culture where vocations are talked about and young men are gently invited to consider a call. Pray for the seminarians by name at every Mass. Some parishes dedicate every week to praying for a different seminarian by name. Regularly have a holy hour for vocations where parishioners spend time before the Blessed Sacrament praying for vocations. Start a vocations committee in your parish and get some good ideas about how you can promote vocations in your own way in your community.