I can't be sure about it. But I don't think Bitcoin is done breaking new records. The new cross-asset stock-to-flow model seems to work fine in predicting the valuations of many kinds of asset classes, not just Bitcoin. That the stock-to-flow ratio of Bitcoin (the number of years it takes to double to existing Bitcoin stock given the issuance schedule hard-coded into the protocol) doubles every year means that Bitcoin becomes scarcer and thus more valuable assuming that interest in it stays constant. What I consider likely is that central banks will be forced to keep printing more money to stave off a debt crisis and all that money will end up in the financial markets to prop up all asset classes. Cryptocurrencies are an emerging asset class that has recently drawn interest from institutional investors. I'm inclined to believe that Bitcoin will go much higher than the previous ATH.
RE: Someday, are you sure that the value of Bitcoin will exceed USD 19,783 like last December 2017?