How do you handle the logistic? Using third-party storage and shipping? Creating and running self-host shop is not difficult, but I found the logistic of handling inventory and shipping that tie you up.
A friend of mine with a similar business in a different field tried outsourcing that a few years ago and it didn't work well, I didn't really understand why until I started.
We sometimes pre-configure gateways and devices for customers, so we need to pull them off the shelf and work on them first, then pack all the other stuff they ordered into the box and ship it. It's invaluable having the stock close to hand.
My solution - hire someone to help with the logistics.