DAO also has a marketing plan. It was drafted voluntarily by two people, one with several months of product marketing experience and the other with 25 years of marketing experience. Then submit it to the public forum and have a dedicated Discord channel for discussion.
At this stage, members with various backgrounds, some have marketing backgrounds, some do not, and they all participate through criticism, suggestions, objections, and support.
The final step is to redraft the original proposal until it has the support of the majority, and then proceed with the snapshot for the token holders to vote.