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Hi Simon! As John said, a link to your site or a little more detail would be helpful here. There's a lot of reasons a site's visibility could be low (a technical issue, low-quality content, poor keyword/page alignment, high competition etc). I know you're saying these things check out, but it's better to be able to take a direct look at things. It could also just be a metrics/data issue or misinterpretation. For example, visibility percentage can be impacted artificially by the keywords added to a rank tracker. A better way to look at it might be - have you seen a major change/drop in clicks in search console? If so, can you narrow it down to a specific date or segment it out to find specific keywords or pages that lost visibility?

Hi Simon It is best practice to ensure that all Titles, Descriptions, H1, content and ALT tags are filled in correctly. The problem you may have (and I have experienced this with one of my clients recently - so it isn't theory!) is that Google may distrust the canonical if it sees that those two pages are not in fact similar. The essence of the canonical is that both pages fulfil the same intent for the user. If that is not the case then they should be separate pages. If it is the case then it stands to reason that they are the same or markedly similar content. If you miss out any of the elements that there is a strong argument to treat them as two different pages. If Google then re-indexes a canonicalised page then two 'similar' pages end up in search which will drop both pages! So contrary to what Joseph says - it is actually very important to do this I hope that helps. Kind Regards Nigel