Tracking the success of your Discord marketing efforts involves monitoring various metrics. You can measure the growth of your server, the level of engagement within the community, and the conversion rate of users taking desired actions. Discord's built-in analytics tools provide insights on member activity, message volume, and demographics. Additionally, monitoring referral traffic from Discord to your website or tracking sales generated from Discord can help gauge overall effectiveness.
source: https://www.inoru.com/discord-marketing-services