Effectiveness is something that cant really be determined because no matter if its new or old because this market has nothing to do if ever you do make use of old methods or strategies.
Its either new or old as long it does give out some considerable winning and profitable trades then this what matter the most.Just like on what others been saying that you should really be that versatile
or could really make out some positive results because you are the ones who would really be making out adjustments if ever one of those strats wont work.Of course it would be normal
that you would be finding for something new which you would really be having that trial and error.
If we talk about old or new strategy, I don't think it has much effect on your profit.
There is no such thing as a market following a strategy but a strategy that follows the direction of the market, for example the market is trending down, we must follow the movement of the price direction within a certain period of time.
Never force a strategy if it is no longer suitable for the current market conditions.
You are right, use the most effective strategy that can reduce the level of losses, I myself always use this method, following current market conditions and not being pushed by old or new strategies.