A professional travel agent is like a family doctor: they have a database of long-term regular tourists like AroundTravel does.
If you are going on holiday for the first time (or have never used travel agencies before and do not know any travel agents), ask your friends who travel frequently: who is their family travel agent? It would be good to find an agency that has been working with your friends for more than one year.
Look around in busy areas of the city: there will probably be signs of travel agents. Enter the names in the search, read the reviews. Pay attention to travel agencies with experience and some history – long-standing, with a large number of different live (not commissioned, this is immediately noticeable) reviews over the past years.