Hello {First Name},
Your {3-month} free trial is almost up. We hope [product name] has been serving you with the best possible experience. Here’s some good news for you! Your journey with Product 5X does not have to end this way!
If you join up for at least {3+1 months}, we'll extend the free trial period to one month. To get started, follow this link.
Please feel free to contact me if you have any questions, and I will get back to you as soon as possible. Alternately, you might want to look over our FAQ section.
Regards,
{Your Name}