Asking around your network, maybe https://growth.org/ https://growth.org/ (I don't participate there but it's a large marketing community), marketers at compani

Asking around your network, maybe https://growth.org/ https://growth.org/ (I don't participate there but it's a large marketing community), marketers at companies you admire who've been there for 2-3 years and you suspect might be open to a change, and good marketing blogs. Some ideas to get you started, at least.