For me, it was unlearning. Algorithms and things in this digital age are always changing. To grow, you need to unlearn the things that worked for you previously and try new things.
Talk to other people (your leads, your clients, your colleagues from another team and other marketers from other companies). It's really useful to renew yourself and test new things all the time!
The speed of experimentation is critical. If any team can't launch experiments quickly, people burn out, time and motivation are lost, which is more essential than losing money.
I think constant re-learning and being adaptable. I'm currently working freelance and I have to evaluate proposals it's amazing to me that some people have a plan that they stick with without adapting it to the people, product and market.
Plezi