Did you say ‘really passionate’?
I applaud your interest in investigating to find the right fit.
I don’t know if you’re in the US. If so, Citizens’ Climate Lobby is organized into 587 chapters in US congressional districts. You might read info about man-made climate change. Many libraries have online books you can access in addition to actual hard copies. Learning or reading more about this may make you passionate enough to seek to inspire your elected representatives and perhaps also your community via local media. Contact info for your reps is provided, depending on where you live, so it’s easy to phone or email them. You may take ownership of an issue some consider an existential crisis.
In another way to be involved from home, Amnesty International likewise has an Urgent Action Network in the US whereby you may contact authorities via email or phone when someone’s in imminent danger of human rights violations. These could include detainees and/or prisoners. Judging by its name, it’s not active just in the US.
You can participate in these or any cause(s) that you feel you can get behind with intense sentiment. Perhaps you’d prefer helping homeless or itinerant persons. If you’ve never “worked” at soup kitchens or food pantries, those might be tasks you’d deem worthy of your time and effort. Victims of domestic abuse and/or orphans can use a hand, too. Animals that have been abandoned provide yet another opportunity. Volunteering is not easy. So I think you are on the right track by discerning an area you feel will be important enough to you to help make a difference.