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Here are some common factors that might be affecting the visibility of your homepage:

Indexing Issues:

Check if your homepage is indexed by search engines. You can use the "site:" operator in Google (e.g., site:yourdomain.com) to see if your homepage appears in the index.
Verify that there are no directives in your website's robots.txt file or meta tags preventing search engine crawlers from accessing your homepage.
Crawl Errors:

Use Google Search Console or other webmaster tools to identify any crawl errors that may be preventing search engines from accessing your homepage.
On-Page SEO Issues:

Ensure that your homepage has relevant and unique content.
Optimize meta tags (title, description) with relevant keywords.
Check for any HTML errors or issues that might affect the rendering of your homepage.
Technical SEO Issues:

Examine your website's technical aspects, such as page load speed, mobile-friendliness, and security. Poor technical performance can impact search visibility.

Forum backlinks can be part of a broader SEO strategy, but there are several considerations to keep in mind:

Relevance: Ensure that the forums you choose are relevant to digital marketing or related topics. Posting in forums unrelated to your niche may not provide significant SEO benefits and could be considered spammy.

Quality over Quantity: Focus on the quality of the forums rather than the quantity of backlinks. High-quality, authoritative forums are more valuable than numerous links from low-quality or spammy forums.

Participation: Actively participate in the forums by contributing valuable and relevant content. Avoid simply dropping links without context, as this can be seen as spam and may result in penalties.

Anchor Text: Use natural and relevant anchor text for your links. Avoid over-optimizing with keyword-rich anchor text, as this can raise red flags to search engines.