The first step to overcoming cognitive biases is being aware that they exist, then noting the ones that may be present in your own subconscious. Biases are especially challenging to note because of how deeply-rooted in our subconscious they are—but by looking out for certain signs, you can identify and combat biases in UX research:
Identify your own assumptions with your team early on
Create a research plan with clear objectives and goals
Conduct research and analysis with a colleague
Question people’s reasoning and ask for evidence
Refrain from oversharing details and emotions
Provide space for your participants to form their own opinions