I suggest that you start by taking a step back to really diagnose the problem. Why is it that the team wants to ship so many features?
I try to always assume good intent. With that in mind, the team's actions are probably logical, but there is either mis-alignment on the goal they are optimizing for or the process that will best get to the goal.
Start by getting on the same page about the goal. Do you have the same undersatnding of vision for the future of the product? Are you focused on the same metrics? Are you building for the same segment of customers?... Does the product team well understand that segment of customers?
Once you're aligned on the goal, then align on what approach will best get you there. Why is shipping 3-5 features better than 20? What are the pros and cons of each approach. If you can tell a good story about why your approach is best to achieve a shared goal, you just may change their mind.
If the root cause is that the product team doesn't understand the segment of customers well enough, that is great signal that there is need for research or a customer immersion. Consider getting your product team in front of your customers so they can hear first hand what their needs are.