Altcoins not growing has nothing to do with Bitcoin and everything to do with the vast majority of altcoins being trash or scams. These are projects with a market cap of millions or billions of dollars that don't even have a working product. ICOs raising billions of dollars on empty promises. You think they should be worth more?

If you want an altcoin to grow, then make a product that is useful, instead of just slapping "Blockchain" and "ICO" on some trash in order to make easy money.