SEO is the precise science of adjusting one’s website code, structure, and content to make everything visible on the results page of a search engine for your particular keyword or some combination of long-tail keywords. The ultimate goal for any marketing venture is generating a return from your investment, and SEO services are capable of giving you very nice returns by means of bringing people to your specific website over your competition, through the results of search engines!
If your goal is to boost your rankings for your website, bringing it to the very first page of Google (or another search engine), a niche relevant, custom PBN is what you truly need. As you are aware, the links coming from different websites, relevant to your specific niche, are always the most effective. This is why having a nice relevant PBN customized to your needs is used as one of the top SEO strategies currently.
For most, the trouble begins when they try to find a domain that is high-quality, has solid metrics, a clean history, and is still relevant to the niche they want. Hiding footprints, configuring private DNS settings, setting CMS, getting the right content, and publishing all of that content takes many hours to accomplish.