"a protest against Dutch subsidies and tax breaks to companies linked to fossil fuel industries"
We can do all the activities you mention with a much lower impact. And fighting climate change allows many farmers in developing countries to actually survive. (Think of the problems with cocoa harvests failing or with Mongolian herders losing herds three years in a row instead of once a decade.)
I've read over 50 books since the start of the year. I only buy a book after I've read it 2-3 times. How? Sign up at your local library! (And keep signing up wherever you can get proof of residence; I've managed to collect 4 library cards.) And then find whatever system they have for borrowing e-books (mine work well with Libby). I've found that I almost never lack for books. A kindle or e-reader could be a good investment to limit screen time; you can download library e books onto them auite often.
Browsing the physical library is more fun than browsing online for books. Just pick the covers you like, check if the summary sounds fun, and give it a shot. Never feel guilty if you don't read a book you checked out or put a hold on. Sometimes it just doesn't sound as good two days later.