Intimate Point of View

Have you noticed that in some books it feels like you're actually there? Well, yeah, of course! But the question is, why? Well, it's probably a combination of a number of different things, but one big part of it is probably something called Intimate Point of View.
Here is an example of IPV(Intimate Point of View)
Arianna groaned inwardly, trying to hold the tears back as she stared at her now soggy cereal. That certainly hadn’t been the lecture she’d been expecting. Now she might have to move to a different city-state! Maybe even to the other side of Gaisma!
Here is that same paragraph, except without the IPV.
Arianna groaned inwardly, trying to hold the tears back as she stared at her now soggy cereal. That certainly hadn’t been the lecture she’d been expecting, she thought. Now she might have to move to a different city-state! she exclaimed. Maybe even to the other side of Gaisma! she finished with a groan.
Now, which one feels like you are the character? The first! DUH.
How to do it:
-Start with an action so that people know who is thinking.
-Take out all the 'she thought' 'she saw', everything that the person wouldn't be thinking. (You wouldn't think 'she sees this amazing animal' you would think 'that's an amazing animal.')
That's it! And no, I didn't think this all up by myself :) My favourite author, Bryan Davis, uses this technique and I watched a youtube video he did on it.
Hope it works for you!