there is no prayer technique guaranteed to give you mystical experiences, emotional highs, or make you hear voices. All prayer is conversation with God which means it is a two way street. as in any conversation, the other person responds when you allow and invite them to respond. That means silence, first and foremost, an interior receptive welcoming silence that should be part of all prayer.
the most common ways God speaks are the obvious, through his scripture, which is why scripture should be part of every Christian’s daily prayer. Then God speaks through his Church, who guards and transmits his revelation, through the bishops and priests in their teaching and preaching offices, and through those commissioned to teach the faith in classes, books, apostolates etc…
God can certainly speak personally to individuals in prayer, but in his time, not because we demanded it through actions of our own.