I would estimate the eso level of flow state as a 5. The reason behind this rating is because flow state is often associated with mindfulness meditation, which involves focusing one's attention and being in the present moment without judgment. This practice has been extensively researched and proven to have various mental health benefits. While some might argue that it belongs to a higher or lower level, I consider it to be closely related to adaptogens and other practices focused on personal growth and well-being.