Resources for UXR Career Growth at Staff and Principal Levels

hi all! i'm looking for resources on uxr career growth for individual contributors at the staff/principal level. i know it differs by company but i'd love to generally read any newsletters and reflections from uxr's who've stayed ic for 10-20-30+ years. i would love to read about what that looks like and what the biggest differences were when they moved beyond "senior". i got the idea after seeing garron engstrom's "super ic" archetypes on linkedin, and was wondering if there's a research-specific version of this thought leadership :)