Have seen some talk about people boycotting the Big 5 publishers. Because they own so much, I personally don't know how possible that is. But there's a good article out about some indie publishers which may help - https://bookriot.com/best-indie-publishing-companies/
@awenspark@bookstodon yeah, I personally think an author strike is what's needed. But publishing is such a global business, without a single global union, that's hard to arrange.