@Veerle8
Veerle, how did you lose your property? was it the result of a tornado or some natural disaster, or was it the result of property management who found out you were short term renting and terminated your lease?
If this loss of yours was by a natural occurence you can call Airbnb support and explain your situation, cancel all your upcoming reservations and then have Airbnb classify the cancellations as having occured under extenuiating circumstances. That way you will be released from those bookings without any penalty. Loss of property (not sale) is an acceptable situation for cancellation under extenuating circumstances.
I hope it is not the other reason though and you have been operating an STR without approval. If that is the case I am sorry to say you may have difficulty getting a successful outcome.
One thing I have found helpful to my hosting Veerle, I have formed good relationships with other hosts in my area, and occasionally we do take over each others bookings. I have two coming up later this month for one host who has unfortunately been diagnosed with breast cancer, and I am taking over her bookings while she is having treatment. It may pay to try and go down this path and relocate your future reservations, rather than just cancel them. You can't just arange for another host to take your reservations, but customer support can achieve it for you!
Try to give us a bit more detail and we might be able to better assist you!
Cheers.....Rob