I recently tested some new creatives. I tested 3 creatives with my best audience and I put a $30/day budget. Over 5 days my ROAS was 3.8 and I had 2 profitable creatives. One with a CPA of $12 and the second $8. I want to scale that better creative and I duplicate adset and put only that creative with $30/day. 1st day I was breaking even and on the second day, i am not profitable. That second creative spent over $60 in the testing phase so i thought that that is enough, had great CTR, CPC, and CPM of $7.
So what am i doing wrong, when you test creatives how do you proceed with winning creative?