BuddyPress.org

Unfortunately, there’s no hook in the “My Account” menu to add custom items so you’ll basically need to duplicate the bp_adminbar_account_menu() and add your changes, then remove the bp_adminbar_account_menu() function and add your custom function.

The following guide tells you how to do this:

https://codex.buddypress.org/how-to-guides/modifying-the-buddypress-admin-bar/