I think many friends now know the existence of cryptocurrencies. Everyone has their own judgment. Some people don't need your encouragement. They also see the existence of encryption value. Some people even encourage it. Will not join.
Yes we are different thoughts and opinions so we cannot blame other people are not interested to join in investing in cryptocurrency but don't lose hope some people are interested and open minded in this kind of investment cause they know the benefits and advantage when they invest a a high profitable income they get..