it's too risky to sell all altcoins and hold bitcoin, but I think the risk of holding a bitcoin is not as big as holding an altcoin. Bitcoin has proven to have great prices and great potential. maybe if now the altcoin held is an altcoin that might have a low price I don't think it's a problem to sell altcoins and buy bitcoin.
That's right because bitcoin is a high-potential coin and the number one coin that many big investors are interested in, so to sell all your altcoins for bitcoin is not too risky because there are many people who get promising results from bitcoin