What is the ruling on a person who has embraced Islam and wishes to marry a Muslim girl whose family opposes their marriage, and how can the family and tribe be convinced?

He congratulates you on the great blessing of Islam, for it is your path to Paradise and salvation from Hellfire. Regarding your desire to marry a Muslim girl and her family's refusal, the reason for this is the fear of Muslims that some young men from other religions declare Islam outwardly for marriage without applying its rulings. The principle is that whoever enters Islam outwardly is judged as such. The way to solve your problem is to perfect your Islam by adhering to prayer and duties, abandoning prohibitions, showing loyalty to Muslims, and disavowing disbelievers. Then, the girl's family will agree to your marriage.