My favorite resources for returning to running:
Find a good pelvic PT who's well-versed in return to impact/running, as well as natural footwear. Find one here and call to interview them before going in: https://pelvicguru.com/

Article by the British Journal of Sports Medicine on postnatal return to running guidelines - includes a nice infographic: https://blogs.bmj.com/bjsm/2019/05/20/ready-steadygo-ensuring-postnatal-women-are-run-ready/

Nike Run Club app: guided runs that help you take it slow and encourage you along the way.