I know that it's kinda 'big' question but it will be great to see what the community think about that.
what do you think can cause the price to go up?
From my own perspective, Bitcoin needs two features to power it up adequately. These are improved scalability and integrating smart contract just like that of Ethereum blockchain. With scalability it can handle large transactions without any much clog in the network and also allows tokens to be built on it via Smart Contract.