I Believe, if we can spread value of BTC, surely people will invest future more than today, no one believe anything without reason, therefore we must explain for people who are willing to invest about BTC,
This is where your sentence should have ended. We must explain BTC to people who don't quite understand exactly what Bitcoin is. We need to spread the word and let others know why BTC is important and why it is a big deal. I strongly disagree with the rest of your sentence though:
If some one brought a bitcoin in 2010, how much money they can earn within few years, that is the message we should give for society.
No, this is not the message we should be telling society. This paints Bitcoin out to be a get rich quick scheme and it actually makes Bitcoin seem less legitimate and more like a scam.
This is not what Bitcoin is about, Bitcoin has nothing to do with making money. Bitcoin is about decentralized trust. Bitcoin gives options to those that want to be free from government and their tyrannical rain. Bitcoin is about giving the power to the people and overthrowing the Wealthy 1% monarchy.
If you run around telling people that Bitcoin will make them rich, you are actually hurting Bitcoin. In their minds, Bitcoin's only use case is making money, but this is simply not the case. These types of people only buy Bitcoin in the short term (because they want to get rich quick) and they will likely sell any Bitcoin they bought at a loss during a bear market. They are not long-term users, and that is what Bitcoin needs. Again, Bitcoin is about changing money, not making money.