Fighting imposter syndrome is definitely an ongoing process. I’m relatively new in a managerial position, and I’m still learning every day. So, it’s a great breeding ground for imposter syndrome.
The weird thing is that I know my work speaks for itself, I have full confidence in my experience and skills as a writer—but that nagging voice is still there in the back of my head. I don’t hear it as much now, but it took a lot of work to get there. My partner told me something interesting once: “The way you feel is real, but what the voice is saying is not always true.” And that’s really helped me whenever those imposter-y thoughts come up.