Going Through a Bad Stretch or Needs Refining?

I'm wondering at what point do you decide that your system is not just going through a bad stretch, but actually needs refining? I purchased a swing-trading indicator that combines MACD and a Currency Strength Meter and looks for confluence along D1/H4 then prints entry signals on the H1. I've been using a 1:1 R/R and the first 6 weeks I averaged a 65% win rate, which I was quite happy with. The past few weeks have been awful though and have only managed to win 37% of my last 30 trades. Is this a moment in time when I should maybe be looking for an additional tool in order to try and filter out losing setups? The author of the indicator insists that it is a stand-alone indicator, but I am having my doubts... Thoughts?

One thing about trading system bought is simply the technical know how and the character behind it , trading system comes with the a particular character a trader is to portray to be able to amassed the results positively from that system , and the technical know-how to be honest with you, if you don't understand 80% of that system and it doesn't connect like it yours then you should stop using it and go and learn trading with your own understanding, you cant trade someone else system without making it yours

You have described that the indicator worked perfectly.

By this i mean that it generated money for the author. Even a broken clock is right twice a day. The trick is to be selling broken clocks at those two times.