This is really good. I feel the most important part of the PMs role in Platform teams is building customer empathy and established product thinking when delivering platform capabilities.
It's always important to establish a northstar that the team can be inspired to work towards and establishing a vision and mission statement can really help bring unity.
Defining "hero" metrics to measure what success looks like can be really powerful to get build credibility and get buy in from senior leadership.
Lastly using techniques like User Story Mapping can really drill in the outcomes platform teams try to achieve and build empathy based on business value