This little trick is so simple that anyone can do it - unless they are in a congregation so small that they don't use microphones. Because, yes, this has to do with microphones. When it is the congregation's turn to confess their sins, confess the Creed, or say the Lord's Prayer, turn off the mic. It is arguably the easiest way to help a congregation find its voice, and yet so many places don't do this.
For pastors who don't have someone at the sound board who can do this for them - though I'd think someone can and should be found to do this - the alternative is for the pastor not to say those parts. Just like the pastor does not say the responses "Thanks be to God" or "Praise to You, O Christ" after the readings.
What? Pastor you say you DO say those parts? Well, stop it. As Bob Newhart famously said, "Just stop it!" Seriously, there may be an awkward pause at first and you should explain to the folks why you are doing this, but let them take ownership of their parts in the liturgy.
This is Step One to "Helping Your Congregation Find Its Voice." More to come. Stay tuned . . .