Every time you link to another one of your posts using a specific text it helps to tell Google that that other post is about that specific thing. In turn, this helps that other page to rank for that term. And the more pages that you have linking to a specific page using that text the more it tells Google that that page really deserves to rank for that keyword.
It can take time to build up your personal freelance business. Yet, there is more demand than ever for freelancers. So, if you want to kick start making money online through freelancing you can join one of the top freelance networks, such as Flexjobs, SolidGigs, Contena, Upwork, Fiverr, or PeoplePerHour. Sign up, build your profile, upload some samples of your work and start making extra money by doing small freelance jobs.