The challenge I always have is to convince people not to invest in bitcoin. After all bitcoin is not an investment and it is not meant to give you profit. It is a currency and if you want to introduce it to someone you should introduce it as a currency too. That way they won't have a heart attack each time price has a sudden drop or a sudden rise while using bitcoin the way it was meant to.
Exactly if you are introducing bitcoin to someone explain him the background why it's useful because of decentralisation not how it will give them profits if they hold it because if someone has not understanding about it how it works then with little volatility he will be affected because he will see his investment going down treating it as an asset but for those who also forsee it as alternative mode of payment with deflationary nature they will hold it for long term and use it as well without getting panicked like most of newbie and some old investors do.