I'm sorry to say that, but your strategy was probably NEVER profitable. It only seemed so, but it wasn't.
Systems with the absence of stoploss usually seem profitable for several months, but they are a time bomb just like systems with martingale money management and other insanities.
First off, try to apply a stoploss on your historical data and see if it would remain profitable (I personally doubt that). If yes, bingo, just use a stoploss. If not, you should just start over and find a strategy WITH a stoploss.
A hard thing about business is minding your own.