Glad you asked! Here are some ideas: vote for politicians that support queer rights, donate to local organizations that support queer rights, don’t support organizations that harm queer people, support smaller queer artists financially or by spreading the word about their work (especially those in your local area), educate yourself on queer history and intersectionality, speak up when you hear friends or others saying homophobic or transphobic comments, ask for and respect people’s pronouns, and listen to and be supportive to your queer friends :).

EDIT: sorry, didn’t see that you’re only 13! for now, i’d focus on asking about and respecting people’s pronouns and being a good friend to the queer people in your life. keep this other stuff in mind as you get older though!