You are over-thinking this. If you like to bake, then bake. Watch some Youtube tutorials (there are tens of thousands of them) to improve your technique- pick cakes, cookies, bread, whatever you want to try. It doesn’t need to be an official “EC” for it to be valuable for you.
If you want to help the community, do that. Volunteer at an assisted living facility as an activities aid-- suggest baking, but also work with the residents on arts and crafts, chair yoga, whatever they are doing. Or continue working with kids- your local YMCA probably has a kitchen and you can suggest a cookie exchange as part of the regular programming.
Your baking interests do not need to become a full-on “EC/Community Service”.