3 answers
Steve’s Answer
Enjoy the Marketing field and just be assertive....
elaine’s Answer
I used to work at ad agencies earlier in my career. There's a difference between working in advertising agencies and working in an advertising department in-house.
Speaking about agencies specifically, you will most likely be working on multiple clients and projects at the same time. The return-around time will not only be set by your team, but coordinated with your clients. Because you have many clients to work with, you may not be as deep into their problems and use cases as you will be when you're in-house.
It's also very possible that you'll be working on some clients while at an agency, that you don't agree with their stance or their offerings.