You can give up Harry Potter. It’s the right thing to do, it’s worth it, and it’s the adult decision.
It's a children's story. I don't think you're asking for people to leap over mountains by giving up childhood things as an adult.
At the same time, people seem to fixate on the consumerist aesthetics and ignore the material realities. If you've got transgender friends and family that you support with your time and care and money, and you want to flip through an old dog-eared copy of Philosopher's Stone (or rewatch The Usual Suspects or throw on an episode of Fat Albert) because of nostalgia, I don't think you're committing any kind of grievous sin.
JK Rowling isn't going to stop being a billionaire because you played a HP themed video game or watched an episode of her rebooted book show on HBO.
Meanwhile, abstaining from all things problematic, without doing anything materially positive for any of the LGBTQ folks in your life isn't doing anyone any favors. Being a Consumerist Harpy who only knows how to scream at people for their mass media of choice, in the name of LGBTQ, is turning civil advocacy into some kind of branding exercise.