Add a referral program to your newsletter. Incentivise subscribers to share your newsletter by rewarding them with an NFT or hidden content.
Morning Brew is an example of a newsletter that leveraged referrals to grow its subscriber base to millions.
ShareMint has direct support for Paragraph.xyz newsletters.
To add a referral program to your Paragraph newsletter, go to the Settings tab for your project, click on Newsletter, and paste in your Paragraph slug. When a user signs up on your ShareMint page we will subscribe the user to your Paragraph newsletter and track the referral.