Another tip I can suggest to get you more immersed is a basic meditative exercise that helps improve focus in general and I've found is quite effective in VR...focus on a close by object while in VR, it can be a wall or any object really, though the more it jumps out to you as something aesthetically pleasing or interesting looking the better. As you focus on that object study the details of the texture while also focusing on its proximity to you (the feel of how far away it appears), focus on its depth, its 3D-ness, and place in the world relative to your position. The longer you focus on it the more tangible it seems, as though you can reach out and touch it, also imagining touching the object helps too. I've found that this simple focus exercise can help bring higher awareness to your immersion levels in VR, and well, your general environmental focus and awareness as well. Sorry for the rambling, hope that helps should you ever run into a lull in your time with VR.
I did this yesterday with Playstation VR Worlds. It was a moment in one of the Ocean dive experiences where the fish swims into the cage with you and I don't know why, but it was another "WOW" moment for me where the fish felt like it was real and right next to me. I reached out—knowing it wasn't there—because I really just wanted to touch it.