i think including reddit is a good idea, the largest subreddit specialized n crypto/ blockchains is "r/CryptoCurrency" it has about 8 million members while the active ones visiting the subreddit to read crypto/blockchain news r a couple of hundreds of thousands,they allow the rental of their banner by crypto/blockchain projects/companies, not sure how much does it cost but i think the banner costs $290, they also allow ama "ask me anything"-posts which is a pinned post for answering the answers of the interested ones n ur project, not sure but i think ama posts cost $115, "not sure because they allow their mods to negotiate & make discounts"
Totally agree.