I have struggled with imposter syndrome a lot to realise that product is a role which has inherently built in exposure to stakeholders at multiple levels which makes you more prone to imposter syndrome
I made my peace with it. I take imposter syndrome as the sign of growth that you’re learning and growing rather than coasting at work being average. Use this feeling to push yourself.
Generally PM folks feel imposters when tech or design or strategy, analyse that feeling, discern what makes you feel like an imposter, and then try to work on that area more harder and smarter