BTC is indeed the mother of all coins, and everyone is happy to hold it. I think the price of ETH will also increase as BTC rises. But holding BTC is very sensitive. If we are unable to hold in the long term, we will suffer losses.
Holding ETH is also very sensitive, and can suffer losses, because in 2017 the price of ETH had risen at the highest rate, but in the following years until now the price of ETH has even dropped very badly, so many investors have suffered losses.