Founder and former CEO of Binance Changpeng Zhao advises investors to reduce their altcoin portfolios by at least half and invest in Bitcoin.The altcoin market has taken a step back with a dominance level of 45/100, needing to reach 75/100 for an anticipated rally.CZ suggests shrinking altcoin portfolios and investing in bigger names like Bitcoin for better gains.Stablecoin liquidity and the surge in stablecoin trading pairs are expected to trigger the altcoin market's rally.