Is there some group which collects funds for Bitcoin promotion? If some group like this can create advertisements for Bitcoin, more people can become aware. Such mediums should be targeted which have reach on audience that is still not familiar with crypto.
Bitcoin is already known by so many people and that's why it's not needed to promote it further via advertisements. When the next halving event takes place and the next bull run starts people will promote Bitcoin themselves and the whole media will promote it via their live advertisements.
The audience is mostly on TV media and social media and they really give time to hear anchors and social media influencers. The influencers and TV anchors will promote Bitcoin for free of cost and they'll earn from such promotions. In face Bitcoin isn't like other crypto-currencies that rely on promotions.