One secret (not so secret) method to get repeat customers is to force them.
Errr...
I mean let your customers opt-in for receiving regular shipments of your fine products.
Yeah that.
Jokes aside, creating subscription or recurring orders can be a solid strategy to ensure repeat orders.
The product type will need to make sense: replenishment products or the mystery-box subscriptions seem to work well.
You could start by taking your most popular two products that fit together and creating a subscription version of them. Even with a slight subscriber discount, this could be a profitable product line after the first few renewals.
Once you develop one that starts to sell, then you can start to experiment on a second offer and try to improve.
If you haven't installed Repeat Customer Insights yet, it's an easy way to get a detailed look at your customer behavior. With the Customer Purchase Latency report you can find the intervals customers are reordering at and tailor your subscriptions around them.
Eric Davis
Market to your customer's timing
Figure out how long customers wait in-between purchases and you have a key component for your marketing timing. This is the basis of the Average Latency metric and Order Sequence Report in Repeat Customer Insights.