In the span of just a few months in 2000 the internet bubble burst and 280 companies lost 1.7 trillion USD in value. That is 13 times more than the entire market cap of Bitcoin (!). 13 times all of bitcoin in the world lost for comparison.
Almost a third of them lost more than 90% of their valuation. That means Bitcoin can easily go from 7700 USD now to 770 USD very quickly.
The dot com bubble burst due to growth in that sector not keeping pace with the monetary investment being poured into it.
AFAIK bitcoin is growing at a steady pace with its user base doubling every 12 months. Some of the price growth could be attributed to bitcoin being undervalued over 1-2 years before the last 16 months. Investment being poured into bitcoin is different from the dot com bubble in key ways. First investments in bitcoin are more level headed. There aren't a ton of people throwing their money at bitcoin, expecting everything to turn into gold like there was with dot com. Unlike the dot com bubble there aren't a lot of start ups involved with blockchain. Many blockchain projects are run by established institutions like microsoft, walmart, maersk. There won't be a huge number of failing business ventures involving bitcoin to drag the price down like there was with dot com.
Comparing dot com to bitcoin is a bad comparison. There are few if any parallels between the two. None of which are relevent.