I’ve been in the same role since August 2018 and I still get massive imposter syndrome. The size of the org and technical domain is huge. For me, it’s about celebrating the small wins. Saying to myself “I didn’t know that yesterday but I do today”, or “look how much I’ve helped that person/team”.
This is a luxury, but it’s also good if you have someone in the team that you can share those feelings with? They’ll be able to respond with the value you’ve added that you’re probably not recognising. Or ask some team members for feedback in general?
I usually find it comes in peaks and troughs. Some days I’ll be quite confident and others I’ll feel like I know nothing and I’m useless.
I’ll also add that 5 weeks is not a long time at all in a role, in my experience so far… are you possibly being too hard on yourself?