The good category for this should be in services section. You're offering a service, right?
Word of caution, pump (and dump) groups aren't very well looked upon here. They tend to take advantage of newcomers and generally start well with a lot of hype, and generally end in huge disappointment for a lot of people. But since people are free to make their choices in this new era of decentralization, I guess you're okay to post about your group.
You pointed it out There are also exchangers, who ban users, who are involved in manipulative pumps and dumps.