am i doing it wrong?

[META ADS] My client has a balance of 2,000 (and will likely add more). I ran some tests but think I went overboard; I spent 600 across four tests. Each campaign consisted of one ad set with a single ad. Two campaigns used the same creative, and the other two used a different, identical creative. I set up one for awareness and another for profile visits. Despite the good results—specifically for profile visits (initially 1.60 reais per follower, though the cost later rose to 4 reais)—what did I do wrong?