Buy expired/failed domain
with backlinks. Then, 301 redirect it to your new domain. This will probably add their points to your points. Most reliable way to add their points is, keep their site and slowly convert the content and add links to your site, and slowly add "canonical url" meta tags to their pages, pointing to yours.
When getting links from others' domains,
have a balance of keyword/brand/naked url text.
Link velocity https://www.youtube.com/watch?v=DncF0O7nRHQ