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Thank you to everyone for their input. I appreciate your feedback. I'm going to research more about link building and where to start that process. I will advise against the multi-site approach and focus efforts elsewhere.

1. For increasing Domain Authority, as mentioned in my other answer this is about gaining just a few really good quality links from highly trafficked and trusted sources. This can be done more proactively through maybe outreach or trying to get a story about you done somewhere, or land an interview etc. Or it can be done more passively through exceptional content, or an exceptional brand and you will gain links as a result. 2. Outbound links don't really carry weight in the sense of authority being given to your site the way an inbound link does. Having outbound links on your site may help to a small degree with perhaps your trustworthiness in Google's eyes though. 3. That is correct.