Facebook is the biggest platform nowadays to promote your brand through ads. To find your Facebook competitors ads here are some tips:
-Always look at your competitor's UTM tags in their ads.
-Build a Facebook ad swipe file where you collect information about your competitor's ads
-View your competitor's Facebook ads via their business page or Facebook ad library.
-Get facebook target insights with why I am seeing this ad to see competitor's ads.
-Analyze tour competitors by top social media traffic sources.