Bookingcom cancelled my flight

Bookingcom cancelled my flight scheduled for the October 2025 after I’ve made non-refundable bookings for all the activities.

I had made the booking in December 2024 and had assumed after receiving the confirmation email not too long after, I would be okay to do the planning for the trip.

Is there anything I can do? Would booking.com help to rebook me on another flight without additional fees?

Stressed out and uncertain how to navigate this.

TIA for any input or advice!