Where do I promote my store with Accounts for E-commerce Activity

I am currently working on my store with accounts needed for e-commerce activity, like etsy seller, shopify, whop, banks etc...

My question is, where I reach store owners that will be interested in my product, maybe some communities on discord, forums or other suggestions?

The answer to this depends entirely on the product you are selling. There may be many alternatives, but you need to focus on the product’s core purpose and its target audience.