You can do and use the skills that you have. The schools need you. The teachers need you. Students and parents need you. They need your actual person: your physical personhood and your open minds and open ears and boundless compassion, sitting next to them, listening and nodding and asking questions for hours at a time.
The key thing is, even if you only have a couple of hours a month, those two hours shoulder-to-shoulder, next to one student, concentrated attention, shining this beam of light on their work, on their thoughts and their self-expression, is going to be absolutely transformative, because so many of the students have not had that ever before.