Starting out, I got my first 10 customers for Trunk by talking to users on e-commerce forums and focusing only on features that would help solve their problem. I didn't have any account management features (forgot password, change password, etc) or even obvious features that would make their lives easier (filtering, proper search, etc) for an embarrassingly long time. I still don't have a lot of these things! And the pricing page still... the horror. Instead, I dedicated all my energy to making sure inventory syncing covered all edge cases and worked reliably.
COVID-19 has actually contributed to an uptick in business, especially with brick & mortar businesses that are now looking to also go online.