I'm not sure so just going to throw around some ideas for you. Maybe you can try sell on E-Commerce website, Shopify, Etsy or even on Amazon. Pick a product that you know well and can source the supplier easily. Add some value to the base product and sell under your brand.
If you not keen on dealing with people, try sell products that can't be returned or have low return/exchange probability.
There's also a dropshipping business where you don't keep any stock or even ship it out. Just get the customers and place the order for them.
Now that you mentioned it, I wonder how many kids are using Lemmy. What attracted you to be here?