Looking for bio dad

I am a 31 year old female looking for my biological father. I was adopted when I was 4. I found my birth mom in 2008 and she had very little information and said "it's a toss up between a few guys" Anyway, I did 23andMe hoping to find cousins or relatives possibly on my fathers side. My highest match was like 5% with a woman labeled as my third cousin who stopped responding after a few exchanges. What else can I do to continue my search?