Here are some ways to gain email subscribers:

1. Create a clear and compelling opt-in incentive: This could be a free e-book, guide, or video that provides valuable information that is relevant to your target audience.

2. Use a lead magnet: A lead magnet is a valuable piece of content or offer that is used to entice visitors to exchange their contact information for something of value.

3. Create a landing page: A landing page is a standalone web page that is designed to convert visitors into subscribers. It should include a clear call-to-action and a form for visitors to sign up.

4. Make it easy to subscribe: Make sure that the opt-in form is prominently displayed on your website and that it's easy for visitors to find.

5. Use social media: Share your opt-in incentive on social media and encourage your followers to sign up.

6. Use exit-intent pop-ups: An exit-intent pop-up is a form that appears when a visitor is about to leave your website, this is an effective way to capture email addresses from visitors who may not have otherwise subscribed.

7. Use a lead generation plugin: There are a number of lead generation plugins available that can help you to create forms and manage subscribers.

8. Incorporate email sign-ups into your content: Include a call-to-action in your blog posts, videos, and other content that encourages visitors to sign up for your email list.

9. Host a webinar or free trial: Hosting a webinar or free trial can be an effective way to attract new email subscribers.

10. Lastly, make sure that your email list is GDPR compliant, and that you have a clear privacy policy in place.

It is important to note that having a high number of email subscribers does not guarantee sales, you should focus on building a targeted and engaged email list, this way you will have a high conversion rate when it comes to sales.