You can definitely have multiple accounts on that chat app, but each needs its own email or phone number. Switching between them manually is a pain, and using the same device can flag you if you’re not careful. I use a browser tool to keep my Discord profiles separate with unique IPs and cookies. Check out this guide here https://gologin.com/blog/the-easiest-way-to-run-multiple-discord-accounts.
Nevinocho