The biggest challenge is how Bitcoin can dominate the world market and can be recognized by all countries in the world and become a national currency that applies throughout the world. Surely we all hope that Bitcoin will reach a price that exceeds the highest price that has ever existed and can even be doubled from the previous highest price.
Ten years is like a growing baby but so fast that it is famous and moves the world as a digital currency, especially at the end of 2017 when prices reach almost USD 20,000.
This development has caused a lot of attacks on bitcoin, so it slowly drops to around USD 3600 and fluctuates a little, so I think bitcoin is correcting the ideal price because if it is too high it creates jealousy and many opinions are not necessarily true.