Configuring and managing a server can be boring, so you might take the time to investigate how to create a Discord bot to automate tasks. Discord is also accessible through a number of means ...

This is a discord bot for my personal server. Stuff may be "hardcoded" to my server. for a more flexible bot see https://github.com/Mikk155/discord-bot ...

This doesn't require the user that is going to be DMed to make any interaction. It scrapes all the user IDs in a server then DMs them.