Turkish Airlines Cancellation Chaos! Customer Service Denied Upgrade

I got a plane ticket from Turkish Airlines in January 2024, and my trip has been canceled four times between Dalaman and Istanbul, most recently on April 26th from Trabzon to Istanbul, all for operational reasons. Despite the fact that other flights are available on the same day, I am unable to make modifications because my ticket class is different. Since THY canceled the flight, I believe the remedy should also come from THY; yet, I was told that my ticket cannot be upgraded. Why should I pay more because of your shortcomings? All expenses for lodging, car rentals, and other arrangements have been discarded. I demand compensation for my losses, or a change to a higher-class aircraft available on the same day. PNR: TDDIYB.