If the price of the Altcoin goes up, then the Bitcoin value will go up. The reason is that when the price of Bitcoin goes up, the price of Altcoin goes up as well.
If people start buying Altcoin more than today, the price of Bitcoin will go up as well.
If the price of Bitcoin goes up by 2021, it will be a record.
Am I right?
You are only partially correct, for example, you draw a straight line from Bitcoin to altcoins - this is a curve line, i.e. the function of the growth of altcoins from the price of BTC is not linear. Look at the Bitcoin and Litecoin chart and see this.