GSA SER can be used for money site if you know how to use it. To be honest, the focus should not on link building nowadays.
You should look at content which is suppose to be your primary focus. The steps should be like below.
Main Topics/ Subject/ focus of your site
----> Keyword research for long tail based upon main subject of your site. Example,I want to start a blog about fitness. I would search all possible long tail keywords that are low competition and write contents revolving them.
----> Next make sure you are writing contents that make sense to humans and people actually wants to read them. Focus on the long tail keywords to write.
-----> Make sure you ping your site to ensure search engine see your new contents. And post regularly.
----> Link building would not be required if you follow this step. (I know so call SEO Specialist is going to be screaming). I have done research based upon this setup and see Google sending traffics through. I have ZERO link built but yet I was ranked higher than others simply because my keywords were long tail and low competition.
After so much updates, I think Google has finally learn how to rank beyond backlinks and social signals. For mid to high competition keywords,you would still need link building though as the competition is very stiff and Google is still differentiating by quality of backlinks built. This is where GSA becomes useful. Since DA is no longer available, you should build backlinks that are ******** and has less than 50 outbound links.