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There are not any easy fixes which can replace what a live person can do. Become an active participant in the wedding planning community, or hire an interested college student to do it for you. Every bridal forum, blog, magazine, etc. which accepts user generated content should be read. When appropriate leave comments. Do not try to offer a link to your content with every reply. You will be seen as a spammer and blocked. Be sincerely helpful, offer tips and occasionally link back to helpful articles on your site. This is a highly effective means of link building if you indeed have great content and industry knowledge. You will become known as an expert and a helpful person. You will also stay well-informed of the latest trends and ideas.

Yes the other sites in SERP are not very competitive , do not have access to semrush logs any more

Your site is still indexed, I would suggest that perhaps Google has devalued some of your links. I would have a look at the top 20 or so sites that link the most traffic to you and check that their authority is still recognised. For more information on penalties etc have a look at webmaster guidelines

You have two choices. Honor your design sense and drop the transcript. Honor your SEO sense and include it. The most dedicated designers know about SEO and figure out a way to honor both design and SEO.  They are the ones who succeed and make a lot of money. Figure out how to do both or be satisfied with failure or fractional success. ..... but don't hide the text from visitors.  That will get your site killed in the search engines. =========================== FYI.... the transcript is very useful.  Lots of people prefer to read rather than listen.  And lots of people who listen will search the transcript to read and reread the exact words for the most important part of the video.  Lots of people print. Don't assume that you understand the visitor. You probably don't - at least that is my experience.

Did you check this tool http://www.microsystools.com/products/sitemap-generator/help/video-xml-sitemaps/ ?

I believe they are basically ways of automating link exchange between sites and a network of partners who are willing to exchange. There  is a review here: http://www.searchenginejournal.com/review-linksmanager-links-exchange-toolbar/5440/ It may have grown since that review, and it may have a little, tiny, bit of merit, but I would not make it a large part of your strategy in any way, shape or form. The good links are always the ones that are hard to get.