For decades, every study and evaluation on customer buying behavior rates referrals as an important reason why someone bought.
It's one of the sources that cannot easily be bought, at least not without long-term harm to relationships.
That means you'll need to work extra hard to make sure your Shopify store is referred and recommended. A big part will be building and keeping customer's trust. A smaller part is making referrals easier (e.g. share links, refer a friend coupons, etc).
But don't get them mixed up. The technology and process is worthless if you aren't trusted and referable.
Focus on trust and customers will figure it out.
And if you're having problems with customers not coming back or defecting to competitors, Repeat Customer Insights might help uncover why that's happening. Using its analyses you can figure out how to keep the good customers and let the bad ones go elsewhere.
Analyze your customer's behaviors before they defect
Your customers aren't yours forever. Some might have defected today, never to be seen again.
You need to analyze your customer behavior so you can reach them before they defect.