On pure market making

hi there, fellows. i have some philosophical questions regarding pure_market_making. for instance, i am trading xmr/eth at binance. a quite tight spread, so basically, if i dive near the edge, the trading fees eat the profits, and basically, i work for the exchange. if i keep a % distance from mid price, i need the price to float to get me. that takes time. so i should increase how long the orders remain until changed, and mostly let true stop_cancellation. is there a way to let the order good till cancelled? any other approach to this situation?