Honestly, quit.
Anyone still sticking to Scrum is already behind the times on creating an enjoyable work environment. If they are pushing for shorter sprints, they are doubling down on what makes it bad, not what makes it good.
I'm all for trying to make a place better before giving up, but this is one of the few leadership decisions that are an exception to my ideals. I would just walk out the door, no hesitation.
What are the alternatives? I would love to hear what works well so I know what to look for.
Definitely don't walk out in this job market, but I agree with the gist. OP should find a new job and figure out a way to let the company layoff OP.