Once you've got the basics down, consider adding value with complementary products and services:

• Charging accessories: Travel cases, car chargers, or power banks extend the usability of your devices.
• E-liquid pairings: Match devices with appropriate e-liquid strengths and flavors. A high-nicotine salt works well with MTL devices, while freebase suits DTL.
• Education materials: Simple guides or QR codes on packaging can help users get the most out of their device. This reduces confusion and support calls.

These upgrades aren't required, but they can differentiate your offering and boost customer satisfaction.