Opinions differ greatly on this point, but one rule of thumb is that Bitcoin should roughly represent 50% of your portfolio, in line with its current dominance (50% of the entire crypto market cap is BTC). For your entire crypto portfolio, cryptocurrencies like BTC or ETH should represent between 1% to 5% of your total liquid net worth (stocks, cash, ETFs, funds, bonds, precious metal, etc., excluding real estate and private equity).