Founded & sold a small business - what title to mention on resume?

Hey! So I founded an ecommerce business that I grew to become a market leader and decided to sell it.

I'm looking to re-join the marketing world as full-time and I'm stuck with what title to put. I originally had "Founder" but it sounds a bit pretentious as I was the only one, and unsure if ATS will flag it. I had someone recommend "Growth Lead" but I feel like that implies I'm in a team? I've settled for "Brand Owner" but unsure if that's an appropriate way of describing?