What skills do you currently have? Can you use a screen reader fluently? How much time do you have before you need to earn?
Realistically if you only want to do something online and you aren't willing to learn some new skills, then you may have a hard time finding something decent. Trying to learn how to do accessibility testing is one possible direction, but will involve gaining new skills.
I'd recommend reaching out to some organizations that may be able to guide you better, for example
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