AIn theory, the answer is yes, you should be able to get top ranks without any link building service. In practice, this matter is more complicated. Conceptually, if the technical part of your website is top-notch, and the on-site content has top-quality, then your business should be able to fully satisfy the visitors without link building. So, you should be able to get top ranks. But you must remember that the ranks are given by algorithms, not people. And they are still rigid. This means you also need to take care of the off-site part of SEO to be able to achieve top ranks.