You are probably building junk nofollow links (worse if you are doing it manually). A single GSA blast can index your video and you can get GSA links from Fiverr and dripfeedlinks.co.

If your can create quality backlinks no need to worry about whether it is index or not. Google will defensively index it.

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I think you need to quality backlinks and you should need to web 2.0 blog creation.

There are to ways:
1. Wait. As it was said above if you have quality links - they will be indexed for sure.
2. You can add pages where you have your links to google by yourself using Add link tool from Google.

Focus more on quality backlinks rather than quantity. If you have not tried this yet, you also need to optimize your YouTube channel.

Try to use social media in promoting your Youtube channel. Sharing your videos on social media sites will also bring in direct traffic from social shares. This method somehow and indirectly contribute to your SEO

try to build do-follow backlinks from high PR sites with search engine submission for quick indexing.

Must use good quality content in your post that can generate a good quality backlink & get it indexed in link indexer tools.

Make use of fast indexing high authority sites for creating back links. These kind of links will be easily indexed by the search engines. You should not spam a site, the content should be relevant and of high quality.

Continue doing SEOand SMM work and try to get quality backlinks. If you get backlink from high page rank sites, definitely it would help for indexing.

It's usually very easy and minimal effort to get YouTube videos indexed on Google. What kind of links are you even building?

You should also get views, likes, comments, subscribers etc to your channel/video and it'll be super easy to get indexed in future (instead of just focusing on links).

This can only mean that your backlinks don't have any effectiveness or value, hope you're not doing it manually

To index your you tube videos post in blogs with unique content and update your videos with link it google will index that link