Facebook's Libra payment system could become a serious competitor for Bitcoin. This will happen if the US authorities legalize the companys token.
I think even despite possible competition from Facebook, Bitcoin will continue to grow in price and develop as a technology.
halving will become one of the drivers of Bitcoin value growth, but it is unlikely to increase many times over. Reducing the remuneration for cryptocurrency mining is a well-known event, and its expectations have partially already affected the price of the coin.