What is the specific remedy and treatment for "da'wah" (proselytizing) languor?

The cure for laziness in Da'wah (inviting to Islam) is by strengthening faith, striving against one's self (mujahadat an-nafs), accompanying Da'ees (those who invite to Islam) and righteous people, contemplating the verses and Hadith that encourage Da'wah, and reflecting upon the lives of the Prophets, especially Prophet Muhammad, peace be upon him, and the early Muslims (Salaf al-Ummah) in their Da'wah to Allah and conveying the religion, enduring hardships.