How adequate are Discord Channel Marketing Services?

I agree with you, and Discord is an awesome application that makes the NFT selling easier, but besides Discord exist, other platforms like TikTok and Twitter/Instagram/Facebook really help in promoting your NFTs. Also, need to mention that choosing the proper marketing strategy and creating your own website are also two important parts. In my case, I approached these guys at https://transformagency.com/ to improve my website and optimize him by including necessary mechanisms to make him more visited.