Cancellation of paid and confirmed booking

[Vaishali8]

I booked a room for 47 nights ( 20-dec-19 to 6-feb-20) on 5-june-2019. I paid 70% of the rental in advance on 5-june-19. Yesterday ( 23 sept-19) I booked air tickets ( non refundable for the onward journey on 20-dec & today without any reason Host canceled my booking.
Refund doesn't help. I've lost a LOT of money in travel bookings. AirBnB does not have a similarly priced property in the same area. What do I do?