The hyped in 2017 cause bitcoin and others cryptocurrencies to surged toward the end of the year and complete crashed back to the bottom in December 2018.
I don't think it go down to the bottom as what you stated. We know that back in 2009 Bitcoin price was almost zero so when we say back to the bottom, it should be zero but we are just above a$1k-$2k after the drastic drop.