Automatically sign in even after clearing the cookies

I need to sign out and sign in again with another account. I cleared the cookies of https://themeforest.net/

However, whenever I refresh the page, it automatically logs in to the previous account.

Just to be clear, I can clear cookies of particular sites, not willing to clear cookies of all the sites.

What can I do?

have you tried with clear both browser cache and cookies? have you tried with another browser?

Have you clicked on sign out?

Cookies comes from envato.com and account.envato.com ( auto login )
Cleaning the cookies from ThemeForest won’t help you. You need to clean those as well