Increasing website domain authority in 2023 can be achieved through a combination of various strategies that are both possible and legal. Some of these methods include:

1. Create High-Quality Content: Produce original, informative, and engaging content that adds value to your target audience. This will encourage other websites to link to your site, improving your domain authority.

2. Earn High-Quality Backlinks: Focus on acquiring backlinks from reputable and authoritative websites. Guest posting, content partnerships, and participating in industry-specific forums or communities can help you build valuable backlinks.

3. Optimize On-Page Elements: Enhance your website's on-page elements, including title tags, meta descriptions, headers, and internal linking structure. This optimization helps search engines better understand and rank your content, positively impacting your domain authority.

4. Improve Website Loading Speed: Optimize your website's performance by minimizing page load times. This can be achieved by compressing images, enabling browser caching, and using a reliable hosting provider.

5. Enhance User Experience: Create a seamless and user-friendly website experience. This includes improving site navigation, implementing intuitive design, and ensuring that your website is mobile-responsive.

6. Utilize Social Media: Build a strong presence on social media platforms to increase brand exposure and attract more visitors to your website. Social signals can indirectly contribute to your domain authority.

7. Encourage User Engagement: Encourage visitor engagement through social sharing, comments, reviews, and discussions. Increased user interaction indicates to search engines that your website is valuable and authoritative.

8. Regularly Update and Maintain Your Website: Publish fresh content consistently and keep your website up to date. Regularly monitoring and updating your content ensures its relevance, helping to boost your domain authority.

Remember, increasing domain authority is a long-term process that requires consistent effort and patience. By employing these legal and feasible strategies, you can enhance your website's domain authority in 2023 and beyond.