I don't understand this approach. If you are offering some kind of support to these content creators, whether financial or otherwise, it makes some sense, though not since you haven't stated that you are doing so.

If you are not offering any kind of support, then why specify the number of participants and why tell them to join the discord. You could easily explain any specifics desired here on the post. Your best chance would be to include any relevant information here, especially the server IP. This would allow anyone interested to check out the server and see what they think/create content, or possibly attract a curious player.

Unfortunately, without any incentive for yourself or participants indicated, I see no reason why anybody would create content for your unspecified, generic sounding server.