How do I find the best audience to target inside a DSP (demand-side platform)?

[Daniel]

Finding the best audience inside a DSP usually starts by testing different options. Most DSPs give access to data like location, interests, browsing behavior, and device type. You can create audience groups based on these things and see how they perform. Start with a few clear audience ideas and run small test campaigns. The results will show which groups respond better. Some platforms also let you build lookalike audiences, which are people who share traits with your past converters. Over time, you can fine-tune your targeting by removing low-performing groups and focusing more on the ones that work. What has helped others get better audience results inside a DSP?