As a leader of PMs you need to think about a PM’s career beyond your team and the company. It’s rare for the product they onboarded to or created to continue to present exactly the challenges and opportunities necessary for their growth. You either help them find the next best thing or someone else will...and it’s better for it to be you.
You should have honest conversations with your team members about their career goals. This should be both 1:1 and as a team.
What is the perfect environment for them? Do they see themselves as a founder or a CPO at a 10K+ Fortune 100 company?