do so

With regard to our memory, researchers now tell us that we never really forget anything. The information is all in our head. The problem is the recall. This explains why you can “forget” somebody’s name and remember it the next day. The name did not vacate your head and pop back into it twenty four hours later. It was there all the time but you could not “recall” it initially. Our words affect our subconscious and our memory is closely linked with our subconscious. If you consistently give your subconscious a program that says “I remember things well,” then you will find that your recall will dramatically improve. You will subconsciously expect to remember names and numbers and you will do so more and more.

Q) What can the underlined "do so" refer to?
Is there only one option(#1) available or more?
1. "remember names and numbers"
2. "subconsciously expect to remember"
3. "expect to remember"
4. "expect to remember names and numbers"
5. another possible option?