OK, you have to inspire curiosity to be an intriguing person, but how do you inspire curiosity? The argument is mainly structured to answer that question. One way to do that, according to the argument, is to make yourself constantly mysterious by broadening your abilities.
I agree that this LR section is tougher than most.
The first sentence cannot be a conclusion because it states that it is a given fact. Conclusions have to be independently derived from collected premises, as opposed to being proven facts or blindly accepted ideas due to conventional thought.