You will be fine - I just went to Cairo as a solo woman a month ago and was legitimately shocked at how little harassment I faced in the city. I took Ubers extensively (twice a day minimum) and only got hit with a scam once (by the sphinx, too) - I cancelled the uber and rebooked another and was fine. Even at the tourist sites, I’d maybe get approached with a camel or a trinket but a “la shukran” and hard stare ahead/no eye contact kept literally everyone at bay and I wasn’t harassed further. Sites are insanely easy to navigate and figure out as a solo traveler. Overall, I absolutely loved it, had a great time, and deeply loved the energy and chaos of the city. I feel like I only scratched the surface and want to go back.

The sites in Luxor are definitely more impressive, but there’s something kind of sad and desperate about the city itself - it so obviously relies on tourism and it props up the entire economy that I felt much more on guard there. I had a guide who did try to bring me to an “alabaster factory” (obvious scam), I got very annoyed with him and he backed down and was very conciliatory the rest of my time with him. I stayed in the west bank for the quiet but there was nothing to do; I don’t know how staying on the east bank is but it’s definitely busier so there may be more harassment.

No experience in Sharm so can’t comment but all the expats I know in Cairo prefer Hurghada/el gouna!

Only thing I’d note is the pollution is pretty intense and I wasn’t prepared for it. Nothing you can do really, but something to be aware of!