One email to a list or a segment, sent once, with a reason behind it. A launch, a restock, a seasonal offer, a booking push, or something worth telling people that has nothing to sell in it at all.
Every campaign is built around a single goal. I match the content, the tone and the timing to where the customer actually is in their relationship with your shop, which is usually further back than the brief assumes.
Most small shops have a list. Very few use it consistently. A well-written email sent to 300 engaged subscribers beats a poor one sent to 3,000, every time.