You could partner with brands for sponsored content within your comics. Also, consider crowdfunding campaigns to fund new projects and offer rewards to backers. Don't forget to build a strong social media presence to attract more readers and potential revenue sources.
One way is to offer subscription services. Provide exclusive content for subscribers and charge a monthly or annual fee. Another option is to sell merchandise related to your comic characters.
You can earn through ads placed on your comic book website or app. If your comics are popular, advertisers will pay to reach your audience.