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First, ensure they have a domain authorities that is at minimum DA20. The better the domain authority, the better.
It can be hard to find the right opportunities, but it is worth it. Backlinks can be obtained in many ways. You should make sure you are putting in the best effort to find the right method.
It is a brilliant idea to use broken links. Broken links can be reported and you will do the website and the webmaster a great favor. First, find websites that are relevant to your niche. Search for your niche, then check for broken hyperlinks.
Not only will you increase your website's authority, but you will also make it rank for tons keywords!