I am practicing lbrp and middle pillar for estimately 3 months. MP makes me feel great. I want to feel the same emotions but more intense. I also want to evoke-invoke spirits. Which books shoul i go for? What do you suggest?
Well, I hope you appreciate honesty and openness, because I will try to give my opinion in that way. Here I have underlined everything that I consider problematic in your approach to magical work. Don't be angry, but it is not your fault in principle. Such is the spirit of our civilization - I want it fast, I want to feel, I want to feel more intensely, I want more, I want harder... I think your work would be much more successful if you abandoned such an attitude. First of all, why do you think three months is enough to take the next step? Three months of doing one type of practice is too short for you to move on.
Try to perfect the LBRP. For example, try to perform it as long as possible. Let your performance of the LBRP last 25 minutes or even half an hour. For example, when performing the Kabbalistic Cross, let each exhalation be long and let your vibratory formula last until you practically faint due to the intense expulsion of air from your lungs. Then take a long pause, then inhale, then a new movement, a new formula. Become aware of your every movement, every sensation, every vibration. If necessary, repeat some detail in the ritual several times. When you give the sign of silence, let that silence last as long as possible. Feel that silence. When you have perfected it, then try to perform the ritual as briefly as possible. This time, let it last only half a minute. Finally, perfect the performance of the LBRP visually, because this will automatically teach you how to astrally project yourself. Visualize yourself performing the ritual. You can do this type of visualization immediately after completing the physical performance of the ritual.
And finally, when you have perfected the LBRP, do it in a public place, on the street, it doesn't matter if someone is passing by, if someone is watching you. Do it mentally while sitting in a public place, in transport, anywhere. Learn to let nothing bother you and not be disturbed by any noise or activity of the outside world. Just on the basis of what I have written here, it opens up the prospect of intensive work for a year. Once you get past that, any other form of practice of that type will be like child's play for you. In the meantime, cultivate your mind - read serious occult literature and try to understand.