One is to encourage your clientelle to join TER and write reviews. That's how I came to be a member. Not all will, but if only a few do, that is a lot.
The other is to encourage existing TER members to become clients of yours. The best way to do that is to advertise on your local board, and also mix it up on the various boards so that you become familar to people.
It pays to advertise.
Also, if you haven't already, read the Self Help/Newbie Manual that is linked on this board; especially become familiar with the rules that cover advertising.