Thread is in Gen-OT: GIVEAWAY TCG-<censored by bungee> No, I'm not linking the thread, that potentially gives his stuff wider exposure.

To help you I would start with /2 (tradechat) in every major server and start with a simple message such as: /2 <censored by bungee>

Other tips I can give is: Throw your link in other discords; twitch streamers chat; other website forums; reddit etc etc.. be creative!
Please snip the post if it gets locked, leaving it up just rewards him because it will still get read.