Start a YouTube channel where you share tutorials, tips, and tricks related to frontend development. Cover various topics such as HTML, CSS, JavaScript, and popular frameworks. Monetize through ads, sponsorships, and affiliate marketing.

Offer code review services to other developers or businesses. Provide detailed feedback on code quality, performance issues, and best practices. Market your services on forums, social media, and freelance platforms.

Write detailed technical articles or tutorials for websites and publications focused on web development. Topics could range from deep dives into specific technologies to how-to guides. Earn money through guest posting opportunities or content partnerships.

Create reusable web components that can be easily integrated into different projects. Use technologies like Web Components, React, or Vue.js. Sell them on component marketplaces or through your own website.

Offer online courses or one-on-one tutoring sessions on frontend development topics. Use platforms like Udemy, Teachable, or even YouTube. Cover topics from basic HTML/CSS to advanced JavaScript frameworks like React or Vue.js.

Create plugins or add-ons for popular frontend frameworks or CMS platforms. These could solve common problems or add useful features. Sell them on platforms like the Chrome Web Store for browser extensions or Envato for CMS plugins.

Offer consulting services to help businesses improve the UI/UX of their websites and applications. Conduct usability tests, provide design feedback, and suggest improvements. Create high-fidelity mockups and prototypes using tools like Adobe XD or Figma.

Start a blog focused on frontend development topics such as tutorials, best practices, and tool reviews. Use your frontend skills to make the blog visually appealing and user-friendly. Monetize through ads, sponsored posts, and affiliate links.

Design and develop premium themes and templates for platforms such as WordPress, Shopify, or Joomla. Ensure they are responsive, customizable, and well-documented. Sell them on marketplaces like ThemeForest or TemplateMonster.

Offer your frontend development skills on freelance platforms like Upwork, Fiverr, or Freelancer. Create custom websites, single-page applications, or components for clients. Specialize in responsive design, SEO optimization, or performance tuning to stand out.