There is no way to do it automatically in a natural way. You do not need to go through all of your pages. use Google Analytic and other tools, screaming frog, etc to see which pages you could improve and focus on a few.
A good place to start is your best landing pages that are getting the best traffic. Add some internal links and use the weight of those pages to help other related pages.
Oh yeah, and you do not want to place links on all the pages. Just a few here and there naturally.
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