Bitcointalk should be a significant part of your presence-building, but but it shouldn’t be your only strategy. According to SimilarWeb,
When your Bitcointalk threads successfully facilitate in-depth discussion and information about your venture, that demonstrates that your company has substance and real people behind it. That’s worth showing off and will grow your audience both inside and outside the forum.
I want to add a little of the substance about the audience. If you want to attract and gather the audience at BTT, make it an interesting and realistic topic for you to discuss. An interesting topic in my opinion is to have a futures project.