Semrush is a very helpful tool for keyword research. It does cost money but it gives you what you are looking for, including: Keyword difficulty - how hard it is to rank...

Content should be your main priority. Build out your website and pages with a good 800+ words on each page written well all about your niche. Then check out https://back...

If the ads are of no value, why not just remove them? Even if they're noindex, they'll still use your crawl budget because Google has to crawl the page in order to learn...

A good content length would be between 800 - 1400 words, with plenty of variations in your target search terms. Is your new content shorter than your old content? Is it l...

Plugins that optimise your CSS and Javascript do not usually make changes directly to the file. Instead they minify and combine into a separate plugin specific file. So i...

Linking to penalized site should not hurt your SEO efforts. And yes, the linked site will be benefited.

It depends on overall SEO, both on-page and off-page. In the current scenario, you can optimize the content more and try to win some backlinks for the page.

Ethical SEO - You can promote other links to move ahead of that link.

Both

I would suggest doing some CRO on your pages that are doing well and cutting out the ones that are not working for you. If you have that many ads that are not performing...