I just thought of this, and I want you to view it from your own perspective. As everyone hopes that more people get to believe and use bitcoins, I think bitcoins can gain more new users on a large scale if anyone (whales ) can place their advert through a popular football club just as some companies do sponsor football league. I think this will send a strong message to billions of people across the world who do know but does not embrace Bitcoin usage.
The more people know about Bitcoin, The demand for Bitcoin will increase exponentially. But why we don't see such campaigns is because it is decentralized. Now almost everyone knows about Bitcoin and it is expanding. People will associate with Bitcoin on their own terms. No need for promotion. The popularity of Bitcoin in 2017 has multiplied in 2021 and it is likely to increase its rate even more in the next years. Since Bitcoin has not yet received legal validity in all places, its expansion will only be gained if it is spread among others, not traditionally, but by increasing their own knowledge.