be aware that an online marketplace aggregates all those who sell similar products and then when a search is made us their algorithms to decide who to show - often based on numbers of transactions etc.
So by using a platform like Etsy you are putting your products directly alongside your competitors - or put it another way, Etsy will also be encouraging your (potential) clients to buy from your competitors rather than from you... to the extent that even when looking at your product your competitors will be advertised alongside you...
The market places are also taking a considerable % cut of any transaction, so it can now be hard to make money on these platforms...
the market places can be useful (alongside ebay / Amazon / etc.) as a marketing exercise, but you want as much as possible to drive the customer to your own space for re-sales etc. This means having your own website
Wix is very poor as a technological solution - unless it can do everything you need now and into the future avoid it like the plague - square space is a bit better - wordpress with something like wooCommerce a bit better, but the best option is to use the cloud solutions focussed on this need - probably the main one currently is shopify...
yes, there is a cost to do this, but there are costs to set up a business - don't spend money until you have a strong business plan in place, but once you have, crack on...