And after you educate them, how do you encourage them to invest or use it since this is the future - digital currency?
How? You
DON'T. Don't encourage people to invest in bitcoin or cryptocurrencies in general, possibly even making promises that it will multiply in the future. Take note that while it can multiply multiple times in the future, it can also lose it's value by possibly tenfold. Never ever encourage people to invest in a highly speculative asset. Just tell them the advantages of bitcoin and it's characteristics and that's pretty much it. You don't need to shove it down their throats like how most ponzi schemes do.
Thank you. Maybe "encourage" is not the right word.
Telling them the advantages of it is enough