There are multiple ways to promote your WhatsApp online store:
1. Share your store link on WhatsApp by clicking the Share option to encourage WhatsApp shopping.
2. Generate a QR code for your store link and display it in your shop for buyers to refer to.
3. Promote this link on your social media profiles, or send it through emails or SMS.
4. Distribute pamphlets in newspapers with tags like 'Buy Grocery Online' and QR codes to share your store link.