Marketing covers a great deal -- even the naughtier things marketeers do like demarketing, pressure promotion, negative comparison, etc.
But I'll assume that you just want to make people who are potential customers of your small practice aware of your existence, capabilities and working style.
I accept that doing pro-bono work for a real-life working (or even non-working) person would probably be counterproductive : other people in similar or worse situations would entertain hopes of the same deal; while those clients of yours who'd paid the full whack (proudly but with strain) would feel that they'd effectively subsidised your pro-bono client.
One thing that would bring you in touch with ordinary people, from labourers to tradesmen, engineers to entrepreneurs, dishwashers to publicans is a local voluntary restoration project.
All on these projects would be giving their few hours in the summer evenings for the sake of restoring their village castle, Carnegie library house, old parish hall, etc.
The Tidy Town organisations also could often badly use an architect's advice, I feel.
Sure, many of the volunteers would not be takers for your services for a while.
But it's often what people say about you to others that brings in the new custom, not so much what you say yourself.