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This is a common question in this forum.
Maybe you got some new backlinks with low DA or maybe you've lost some high DA backlinks. You can start looking into your linking profile in the Moz Pro report. More info in this old thread: https://moz.com/community/q/why-my-domain-authority-da-is-decreased-from-21-to-19
Both options have pros and cons. By embedding the articles into the relevant commercial sections you can burst the visibility of those sections (SEO). However, at the same time it will be harder to get backlinks from independent sources like blogs and news because they don't typically link to commercial contents.
The last URL entry is a duplicate of the first one. Everything else looks fine.
Keep in mind that this feature is Google specific. Other search engines may not understand this format.
You can use the Web Console in Firefox to see the URL load speed. According to the screenshot attached there is no delay resolving the DNS and connecting to your website. However, there is huge delay of >5s waiting for the response. So, something must be wrong on the server side. I'd recommend checking the server logs (or the Nginx cache logs because there seem to be a cache).
Notice that this delay has nothing to do with the page size or contents. That's why following the steps to optimize the contents didn't help.
Moz uses a crawler (bot) to discover links in a similar way as most search engines do. It takes time for the bot to discover new links. You can either wait for the bot to do its job or try to help it find your links sooner. The latter means promoting the sites/pages where the links are hosted and using the Link Tracking Lists in Moz Pro.
SEO for videos is a little bit more complex than SEO for web pages because it's necessary to generate the thumbnail for Google, add some code for compatibility with Facebook and other social networks, make it responsive and so on. You can do it yourself or use a plugin to automate all the necessary tasks. I haven't used Yoast Video SEO though. So, I can't tell you how good it is.
Most youtubers don't mind their videos being shared. The more they are shared the more views and likes they will get. Just make sure to credit the author.
The redirects are intended to keep link juice when migrating to a new domain. Actually they just help the existing users find the new domain. If there are redirects to your domain from unrelated websites the Google bot should be smart enough to ignore them. That's why it's better to have backlinks from unrelated sources than redirects.
First of all, Google doesn't use Moz spam score: https://support.google.com/webmasters/thread/2440327?hl=en
So, if your Moz spam score is high because of "spammy" backlinks it doesn't mean that Google considers your site as spammy. You can check the spam score for every linking domain in the Link Explorer. If there are too "spammy" domains take the necessary actions (disavow them in GSC as the last resort).
I'm not sure I understand the question. Are you saying that your have around 50 pages with the same contents? Duplicate contents are not good for SEO: https://moz.com/learn/seo/duplicate-content
So, currently you are using div to wrap the links to the product pages and you want to replace div with h2, right?
Google does like H tags. It will pay more attention to an h2 than a simple div. That's good for SEO.
The problem is that in your case the product entries are almost empty. There is not much content under each product name. It's almost like using h2 instead of LI (list item). Google will not like that.
So, unless you are planning to write some descriptions under each product name I don't recommend using h2 in this case.
You need to check the HTML code of the link. If it doesn't explicitly say nofollow in the rel tag then it is a dofollow link.
For example, this a nofollow link:
<a <strong="">rel="nofollow" href="https://www.mywebsite.com">Visit my website!</a>
If we remove the nofollow property the link becomes dofollow:
Apparently Google doesn't care: https://support.google.com/webmasters/thread/21223241?hl=en
From the webmaster point of view it seems like more work to configure each individual property and review every report separately.
A search engine can discover the pages not only through the sitemap. External links can have different formats and the webmaster doesn't control them. That's why the canonicals are always recommended.