Offer an initiative to encourage customer loyalty. Perhaps an extra perk, a freebie or discount off their next purchase. Implement a points scheme, to collect points and be rewarded after several purchases. This increases the likelihood for repeat customers as they are offered a 'reward'. There are many ways of doing this. The most straightforward is simply to email an offer or perk to your existing customers via your CRM. However, you can get more sophisticated and develop a loyalty app using something like AppyPie.