Most people set it up once and forget about it. That's why they're not showing up.
Google ranks businesses that look active and complete. Here's what to check:
Business name — Exactly what people would search for. Don't keyword stuff it with "Best Plumber Gippsland" — just your actual business name.
Category — Pick the right primary category. "Plumber" not "Home Services." Be specific.
Address — If you service an area but don't have a shopfront, you can hide your address and show your service areas instead.
Phone number — Use a local number, not a 1300. People trust local.
Hours — Keep them updated. Nothing worse than "Open" when you're actually closed.
Photos — This is the big one. Businesses with photos get way more clicks. Add your work, your van, your team, your shopfront. Real photos, not stock images.