I'll do my best to answer your question.
I take for granted that the francophone population, which is made up largely of newcomers and immigrants, is always learning about the existence of French-language services. Upon arriving in B.C., people automatically expect that all the services are provided in English, so the effort to promote French-language services never ends. I would say that, with the tools and resources at our disposal, we manage to reach a good chunk of the population. Do we reach everyone? No. Do we reach the majority? Probably not.
I do, however, know that RésoSanté Colombie-Britannique gives a lot of thought to the advertising of health services. I think any sector that provides little-known services is confronted with the same challenge. That's certainly true of immigration.