As you don't sell the items directly (it's done by eBay/Etsy) it's can be much easier for you as you won't have to deal with the billing as that will these platforms do and send you your money.
That's a big plus IMO. Most people do dropshipping and then they are the ones that need to setup payment gateways, accept payments/cards etc.
Please answer these:
What's your monthly turnover?
What's your profit margin?
Where are your customers at (what countries do you sell the items to mostly)?
Do you ship from your country directly to the buyers?
Did you had any issues with your post︀ for getting and sending many packages?
What are your plans in terms of scaling the︁ business in the future?
Maybe going the route of the Flag Theory would be a good point of view for your setup https://www.offshorecorptalk.com/threads/going-the-route-flag-theory-how-does-this-looks.36970
I'm not sure if it will work like this, but many setup a UK LTD and forget everything about VAT and taxes, once it is time to file a annual report they just drop the company and no one is going to ask questions.