Make sure you are eating well, sleeping well, and doing some vigorous exercise 3+ days a week. After that, look into getting 360° reviews set up at work. It was these that really helped me with imposter syndrome. Having anonymous peers let me know where they thought my strengths were and what areas were opportunities for professional growth was really enlightening.

You don't see the sausage being made in others heads. They will have trouble with things you find trivial and vice versa. If there are things you can learn from them, do so. Practice the things you need to work on. Compare your present self to your past self, not as much to your peers. When I started at my current company, I was the slowest person, had the least professional and domain knowledge, and had to majorly catch up. I set aside some time per night or per week to get a little better. Fast forward and it all worked out. I'm still slower, I think, at a lot, but I have a lot to offer too. Note the value you bring.