For those who do not see things from a peculiar Point of view , better ways have to be found, marketing is what gives very good results , in fact the traffic that is generated thanks to Bitcointalk is unique, just as there are others here forums that are good and that also get traffic, for that reason things can be better here because once in a while there are people with social networks with many Followers.
Well, yes marketing and promotion are kind of the same thing, although promotion also includes non-paid and influencers. I think that youtube influencers can be a good way of promoting and using more than one channel is advisable until you find the perfect combination. It may be very difficult to compete with the incumbents, so looking for that special promotion that the biggies are not using is key to start.