I cannot answer, as I could never be a preacher.
But I do know we are all called to witness, some preachers, some healers, some prophacy..... I believe in this way we are all preachers in the way we are called in Jesus.
I just try to always welcome a person into my home or garden, and wait of them, serving them icecream with home made rassberry syrup, or a goodcuppa tea and jam cake, as it has always been put on my heart to heal through a quiet place of peace, delight , laughter, and the love of Jesus.
Sometimes one just needs a quiet , safe place to spend time with Jesus.
God bless
pickles