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App development, or software in general, is pretty tough. I’ve found much more success with Max Clicks campaigns on highly targeted keywords, with proper negatives lists, than with Maximize Conversions or tCPA. They almost always greatly overbid.
You mentioned you have 20 conversions in the past 70 days, I’ll assume they’ve been uniformly generated, putting you on a rough 8 conversions in the past 30 trailing days, which definitely is too little to succeed on Max Conv or tCPA with.
A rough $40 really isn’t bad. Software development lead gen typically just has lower conversion rates than other types of lead gen.
