We are all aware that the bitcoin is the last hope when the other altcoins including Ethereum are struggling to survive and even bitcoin has not had any massive pump as it's fighting hard to stay on $8,000 despite numerous fluctuations but will it help bitcoin if we just move our funds to bitcoin which we have invested into altcoin as it will increase the demand of bitcoin if everyone can do that as this will literally do what the whales have been doing to increase the price when they want by creating the demand.
It could create a pump in the market, but I don't think it would last. Doing so what you have suggested would indeed increase market value of Bitcoin, but crash and probably remove altcoins in the market, which is bad in the long term. Altcoins somehow still help bitcoin's market to grow through trades, exchanges, etc. from bitcoin to altcoins. If no altcoins exist, bitcoin would only be exchanges to USD, or be used for transfers, which would slow down the market. Sooner or later, it would be no use, people would lose interest, its value won't grow and people may abandon it one point in time.