Can I aggressively interlink Pages from Pages, or Posts from Posts?

Let me clear that out for you.
Suppose I have 14 money contents on my site.

What I have seen so far that couple of exact match type interlinking to a money content actually boosted its ranking and without any backlink it came within top 15. Few Strong PBN links will secure its position in top 5. I am pretty confident.

But, that was a soft touch. Now I am thinking to interlink all the money contents from one another. After each content is finished, I will add a list, linking all the contents with exact match keywords, keywords I want to rank for.
Not only that, I will also edit the previous internal link inside contents and round them up with exact match or partial match keywords.

Before I purchase PBNs or any niche edit backlink, I will like to structure my internal linking via above process.

I am also going to add more contents. So, there will plenty of contents to interlink to each other.

I am open to any suggestion whether to do it or not, or how to perfectly do it.

Thanks,
imonboss

Let's say your website is organized in a silo structure. Each main branch from your homepage has sub-branches and every sub-branch sub-sub branches. In this case I would recommend only interlinking sub-sub branches because they are more topically relevant to eachother. I don't know if I made it clear.

The title and the content of your post is not clear to me. Not sure if I got you right, but for search engines, both ‘posts’ or ‘pages’ are web pages and there is no difference. They are just the terms we use. So just interlink whatever you want where it’s appropriate and relevant. Internal linking is powerful when done right so do it. Use exact match and LSIs for the anchor and make it fit the context of both my pages.