Should I be doing marketing?

You should, if you want to be found by people who don't know you yet. Start with the cheapest layer: being findable when someone searches for your name or your service. Only then add paid channels.

The order is almost always the same: fundamentals first (site, map listing, reviews), then performance advertising aimed at people with a need right now, and finally brand, which makes everything else cheaper over time. Skipping the fundamentals and buying ads straight away is pouring money into a leaky bucket.