Yeh Avni ka Dad na hi aaye toh aur acha hoga. Let him just be a name sake character itself.
They can give proper closure to Avni.
Avni goes to Kalyani and confronts her. Malhar overhears the convo and he tells Avni and Kallu both the truth about each other.
Kallu and he get her boyfriends details and Kallu uses her power to settle Avni with that guy.
Tata bye bye Avni.
Use vamp banane ki zaroorat nahi hai. Let atleast one character go peacefully