Answer
(Fatwa: 201/150/B=1433)
To invite people towards good deeds and reform them requires long patience, endurance, sacrifice and struggle. Tell them time and again about the harm of haram earning and the benefit of halal income. Your duty is only to convey the message and make them understand. It is Allah Who gives guidance. If you attend the meeting of an Alim who completely follows the Islamic teachings or go into tablighi jamah, then it is hoped that you would become a good Muslim. Also you would get the experience of reforming people.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband