This is absolutely amazing to hear about the work that you are doing. In fact it would be amazing for an adult to do, but for a ten-year-old you are phenomenal! Keep it up.
There is lots of great advice above. I will no doubt have advice too but would love to see the links you mentioned first… I do not see them included, could you please share the links to your shopify site and pledgeme campaign?
I own two digital marketing agencies (Likeable Lab and LeadSocial) specialising in social media and would be very happy to support you with some extra guidance and advice at no cost whatsoever. If you would like to take me up on this, please email me firstname.lastname@example.org and I will be happy to guide you as best I can.
Keep up the phenomenal work!