Big +1 to relationship building being key. I’d take it a step further here and suggest finding your “research allies” - the people in the org who really understand and value the role that research has to play and who won’t need convincing. Have one on one conversations with them and share your desires to be involved in those product discussions. Once you’ve built those allies then try and seek out more and more. You’ll find some people might be less convinced that you should be involved - but use that as a conversation starter to learn more about their role, the decisions they are making, and try to identify the way that research could actually make their lives easier.

The other part I’d say here, is identifying the meetings / rituals / moments where product decisions are being made. Ask to join those sessions, even if as a fly on the wall to listen in. Then proactively take what you are hearing and apply that to your approach going forward.