For last 2days bitcoin is continuing it's uptrend run. It's close to 12000$ now. But why all the alts are going down? Especially the top alt coins which had a good price before the dump.
For example BnB was 31$ when btc was 11300$ and ETH was on 380$ when BTC was 11400+$ . Now BnB at 28.7$ and ETH at 370$. Any reason for the dump?
Well, if you are talking about ethereum and bnb, i think you shouldn't worry. Because both of these 2 are the major altcoins and recover sooner or later. But if you hold some other coins (especially not at top20 @coinmarketcap) you should worry when bitcoin has a sharp uptrend or downtrend.
You are probably talking only about these short and slight fluctuations in price. As Bitcoin's price continues to upward, altcoins will continue to rise. At the moment, we are seeing movements that indicate the nervousness of investors who watch the market every day - mainly daytraders. That's why they quickly transfer funds from altcoins to BTC - that's why the altcoin prices are falling. Long-term - capital will flow from the outside and many new investors will see the "new Bitcoin" in altcoins and their prices will surely grow as well.