It sounds like you might be facing keyword cannibalization issues. Instead of deleting pages, consider optimizing each with unique content. Utilize internal linking to strengthen your homepage's authority while ensuring other pages rank for specific keywords. Deleting pages might negatively affect your rankings due to lost content and backlinks.

Start by disavowing those spammy links through Google Search Console. Focus on creating high-quality content and earning authoritative backlinks. Regularly monitor your backlink profile to maintain credibility. Best of luck with improving your website's rankings!

No, NoFollow backlinks are not directly considered in Domain Authority calculations. DA primarily assesses the quality and quantity of followed (DoFollow) backlinks. However, NoFollow links can still contribute to your overall SEO strategy by diversifying your link profile and potentially driving traffic. Cheers!

It's vital to maintain keyword density to avoid over-optimization. For "SEO agencies Cardiff," I'd recommend using variations and related terms in your blog posts. Perhaps include the keyword once every 3-4 posts, and focus more on providing valuable, engaging content that naturally incorporates these terms.

It sounds like you're dealing with significant SEO issues due to duplicate content and non-optimal URL, title, and header lengths. Instead of noindexing, consider consolidating similar pages or using canonical tags to point to preferred pages. This can reduce duplication and focus SEO efforts on key pages.