How do I obtain a certain peak from a repeating pattern?

Hi, x is my signal data and t is my time. I'm trying to locate the first peak of every cycle so that I can segment them. I used the code below but it does not seem robust enough as sometimes it detects unwanted peaks. [pks,locs] =findpeaks(x,t,'MinPeakDistance',500,'MinPeakHeight',165,'MinPeakWidth',100);

Is there a more efficient or elegant way of doing it? What I want are the points that is in the picture below:

Thank you!