Step 1:To challenge to gold in 20 years
I would prefer to just invest Bitcoin alongside of gold in next few years for maximum profit. I don't think because you love Bitcoin you need to neglect the fact that gold exists and some people prefers to invest on gold because of the long-term value and it's widely accepted around the world. Sure, it takes years for Bitcoin to do the same but the fame you get by holding Bitcoin is just unimaginable compared to Bitcoin for now.
.Step 2:To challenge the world's No. 1 currency within 50 years.
50 years would be too long and we don't know what would happen in this world within 50 years.