Not sure if it'll be helpful to you. But for me stoicism (https://plato.stanford.edu/entries/stoicism/) as a philosophy made my life so much easier. I don't remember last time if ever I had ever had an impostor syndrome.

The crux of that philosophy is that you should only worry about things that are in your control. Most things in life aren't such as the made up comparisons of you vs other people.

The other solution that helped me is just to get good at one thing (for me it was keyboard optimizations). So I have at least something I can say I am better than probably anyone.