If you needed any more evidence that Discord is not a good service to use for activist activity - there is no way to delete all your messages. You need to go through an delete them all manually (or if you are an admin you can invite a bot to do it). It's so time consuming to clean up.
A social media instance for Vegans in Canberra, Australia where you aren't trusting big corporations to respect your privacy and data sovereignty. This mastodon is currently and always will be run by the Vegan ACT community.