Question: How can I, as an individual soul, influence all the souls?
Answer: Since we are in a single closed system, you affect everyone else through your ascents and descents.
Question: And how do I increase the power of my impact?
Answer: You develop your vessel, its capacity, by caring about others, which enables your entrance to the general system, and then you attain more.
The more you care about others, the more you attain the one common vessel and perfect eternal life.
From KabTV’s “Fundamentals of Kabbalah” 10/7/18