LB – I am no expert on ruach hakodesh and I welcome corrections but I just wanted to help out with something. I am hearing that you may have an incorrect perception of ruach hakodesh and I wanted to see if I could give you a better version. I am speaking super simplistically and invite corrections from fellow posters.
The Ruach Hakodesh that our Gedolim have is a level of insight, divinely inspired. It is not like getting prophecies or voices from Hashem with messages but rather knowledge and understanding that Hashem gives them. Some have a clarity that includes knowledge of future or past occurrences, insight into the obstacles or decrees against which a person fights or struggles a person has. Some gedolim have said that it is not Ruach Hakodesh but just pure clarity. That knowledge of Torah at such a deep level can give them the ability to see truth as it applies to that person. (I think they are just downplaying the RH out of modesty)
So it isn’t like a secret that gets passed down or a ritual, it is a connection to Hashem and a clarity of Truth that is acquired through completely immersing oneself in Torah and refraining from exposure to tumah. Our neshamos (if I recall what I have learned) have this clarity and connecting closely to your neshama gives you this Holy connection to Hashem.