It's hard to quantify the kinds of doors it has opened for me. I was able to get a scholarship to study in the UK that covered home/EU rates (a third of international rates, while I might not have been able to get even a student loan otherwise), get government funding for a PhD that would not have been accessible to me otherwise and other grants, travel to international conferences without thinking twice about visas (unlike many colleagues) meeting people that would impact my career and skipping all sorts of and barriers along the way, and never had to worry about deportation because of the EU settlement scheme, easily become a founder (no visa sponsorship needed), and so much more! Even travelling/business in the the middle East, being German rather than Egyptian is an entirely different life, one that my cousins cannot even begin to imagine.
There's a parallel universe where I'm stuck making ends meet in Cairo where I was born, dreaming of a brighter future, feeling all my potential fade away. I know because my immediate family is that version of me - no less talented or worthy of the opportunities I got because of my nationality!
I see the kind of freedom that I have because of that passport as one of the biggest modern injustices.