Coin like BNB is a big struck on it's own. It is an alternative of bitcoin.  It is easily used in paying the fees associated with trading on the Binance exchange. As a merchant u may end up regarding if u sell it. Back then there are shops I wanted to trade with that sometimes specify BNB as it payment method.  if I were u, I will keep the BNB, look for other sources to get bitcoin.m and other Altcoins.