the answer is one word:
demandthink about it. price is now $4200, people are now paying forty two hundred dollars to own 1 bitcoin. they want it. the media is helping a lot too. it is no longer a secret thing existing in the nerds basement in 2009

it is out there, countries are seeing it as a currency just like USD, CNY, JPY, GBP,... and that is a huge step forwards.
Yes the demand factor is to be something that keeps the bitcoin price up and exceeds the long-awaited record. Nowadays many people are familiar with bitcoin, they are interested because bitcoin has many benefits. When compared with real currencies, bitcoin is quite risky because the price may decrease. But now bitcoin always shows a very positive trend. I am sure this will continue to increase and we can not predict when bitcoin will stop. We will continue to hope for the best for bitcoin development.