Answer: Nothing helps! Absolutely nothing! Believe me. Try to tie a red string on yourself and wrap yourself in red rags. Nothing will help!
Question: Yet, can it help psychologically?
Answer: Anything can help psychologically. You can make a toga and wear it like in Ancient Rome. But then what?
Spiritual psychology comes only from the mutual influence of each other within the group. Although friends exist solely in the corporeal world and everyone is an egoist, they can influence one another.
Question: Have you come across in any sources the mention of red strings?
Answer: No. Even if it is mentioned somewhere, it absolutely would not mean any corporeal manifestation. Neither Baal HaSulam nor Rabash have written anything about it.
From the Kabbalah Lesson in Russian, 11/19/17