How would you approach the scenario when you're new to a team and coming onboard knowing that you're being charged with reprioritizing marketing's initiatives to align with current company objectives, which will translate into a reduction of support with BAU & legacy projects - and likely not go over well with key stakeholders? Thanks!!
People are inherently afraid of change, so coming into an organization and changing the way things have historically been done can certainly cause fear and doubt - primarily people might assume you are making their roles irrelevant. So with that in mind, I'd lead with building trust. Of course your instincts will tell you to get in and take action - but try and carve out time to bring people along on the WHY behind the necessary changes.
If the changes you're making are aligned to company objectives, then this should mean that the new initiatives will have measurable impact - and people are often motivated by understanding how their work is driving impact in an organization (versus doing something because thats what has always been done).
Spend time with people, letting them know how they specifically play a role in this new world. Give them confidence that they will have a role to play, and let them know why it's important.
Again, change is hard, but with thoughtful execution you can help motivate people to adjust swiftly.