My advice: Think long and hard about which third platforms your products rely on. I understand that it's not practical or even advisable to completely avoid thi

My advice: Think long and hard about which third platforms your products rely on. I understand that it's not practical or even advisable to completely avoid third party providers, but at least your store should be independent and reachable under yourdomain.com. It should be the primary destination for your customers. I'm not affiliated with them, just a happy customer, but a service like Shopify will enable you to run your own store without a technological background or server administration and it doesn't prevent you from also selling via external channels like Amazon, eBay or others. The difference is that your primary store, or in the worst case your domain, will be there even if Amazon & Co. decide to stop selling your products over night.