Your argument is very weak. Essentially you are saying that Bitcoin is going up, and therefore the alts also "need to" go up. In real life, things are not that simple. Have you ever compared the userbase and acceptability of altcoins to that of Bitcoin? Bitcoin is miles ahead of all of them. Take the case of XRP or Polkadot as example. The overall trade volume may be high, because day traders love these coins. But what about the actual usage? Very few people use them for any purpose other than trading. And that makes me believe that these coins are overpriced.