Anyone else feel like a fraud?

I have only been working in SEO for 3 years. The first two, I worked at an agency that focused on local businesses. I excelled at first and was labeled as a big problem solver at my old job. Now, I got an offer at an enterprise agency and feel inferior to my colleagues who have at least a decade of experience on me. I feel like I add no value to our team and everything I know is surface level or dated. I don’t know how I even got hired. I don’t know how I got from being really great at my job to suddenly not knowing what i’m really doing. The client reps seem like they do not trust me on reporting meetings. I feel like I am mediocre at my job and I feel really bad for my clients because I do care about them getting leads. I have seen results for some and it seems like dumb luck because I shotgun it. Has anyone experienced this before? Is this a sign I should pursue a different career path?