I read this and a guy named Jared Tendler popped into my head instantly. He talks about learning and how it happens in his books, I highly recommend you to check those out:

I quote one article that I just googled, it talks about the adult learning model, a very important concept that Jared talks about in his books:

*Note: Tendler calls the theory The Adult Learning Model, but psychology has previously defined it as The Conscious Competence Model (or Ladder/Matrix).
The process of learning a skill is “predictable and has a distinct start and finish.” We’re all unique individuals with personalities. Certain personality types favour certain skills. While we each respond uniquely to various methods of learning, “the overall process is the exact same.”
The Conscious Competence Model (CCM) is a simple explanation of how we learn. The theory describes four distinct stages:
Unconscious Incompetence: “You do not even know what you don’t know.” Namely, you have no awareness that you lack skill. This is the stage of ignorance.
Conscious Incompetence: You’ve gained awareness of the deficit. Now, you know what you don’t know. “You’re not skilled, but you know what skills you need to improve.” You know that by improving in this area, your effectiveness will improve. Becoming conscious is the loss of ignorance, and with it may come guilt. You now realize the effect of your past mistakes. Remember, you can not always be perfect, you can only do your best. “Mistakes are going to happen. The bigger mistake is letting one turn into more.”
Conscious Competence: You know how to do the skill the right way. You can execute the skill at will. However, the catch is it requires concentration. Without focused conscious involvement you return to incompetence.
Unconscious Competence: You have so much practice in the skill it has entered the unconscious parts of the brain. The skill is now integrated into your instinct as second nature. “You’ve learned something so well that it is now totally automatic and requires no thinking. Unconscious competence is the holy grail of learning”, and is by far the most important concept in this post.
Tendler relates the theory to learning how to drive a car. “These levels make sense when you begin to think about your own experience in learning just about anything… as a small child you barely knew what a car was. This is unconscious incompetence. Then, as a teenager, you gained awareness and became frustrated by the fact you couldn’t drive. You became conscious of your incompetence.*

To answer your question, I would say that you have a lot of new information which is in Conscious Competence, which is the third step of the adult learning model. By repetition, your goal should be to get those skills to the next, 4th step: Unconscious Competence. And also, by having a good night sleep, clear mind and all those things, you will be able to use things that are still at your Conscious Competence more often and more effectively.

In my experience the best way is to focus on 1-2 new aspects of the Game, and then wait till the situation appears and act accordgly what you've learned. For Example 3bet in position. Theny practice this part 1-2-3 Weeks, till you are really comfortable with what you are doing and why. Then add another party of your game for example stealing more on button and focus on that, why you are opening certain hands on the button, and what your play is after the flop. Focus on this again for 1-2 Weeks. Besides that 3bet in Position is working, because you've practiced it for several weeks and you know now how to proceed. And in this way you develop your game.

Thanks guys