@falktx
In this case, the matrix bridge helps a lot imo. Matrix users appear as bots in discord, this sometimes start a conversion about matrix among discord users. Another thing to keep in mind is to never promote such platforms - in the above message, he could've at least mentioned matrix and talk about discord as a second option. I don't know what he himself use, but its better to be on a FOSS platform, so that his followers see him use it and maybe decides to join.