Used LM on Swiss, which just cancelled a flight in October 2021 and cancelled my business class seats (Swiss no longer operates one of the flights on my scheduled date).

Is there any hope of persuading Lifemiles to contact Swiss and get them to request additional award space on Lufthansa or a Star Alliance carrier? Right now there are no award seats anymore. I understand that EC 261 may require Swiss to help with rebooking, but when I called Swiss, they said there are no award seats available on the date I need (even though business class seats are available for sale on Lufthansa and United).

I am trying to figure out if I need to re-work my whole trip for other dates (I really want to avoid this) or if there is a way to get Avianca and/or Swiss to free up award seats (given that Swiss cancelled the flight for operational reasons).