To disable your account, rather than delete it, go to the Disable Account page via this link. Ensure the account name is ...

double-check that the "Account to delete" box has the right username in it (this is added automatically and can't be changed unless you change account). You then have the option to tell Twitch ...

During the loading screen, a “Switch Account” option will appear in the top-right corner. If you tap it before the game fully loads, you’ll be signed out and prompted to log in again ...