What is the best all-in-one travel lens for Fujifilm X-T5?

I just got this fancy X-T5 for my big trip to Italy in two weeks and I am honestly panicking because I have no idea which lens to buy. I want just one lens that does everything so I dont have to swap them while walking around Rome. My logic was that a bigger range is better because it zooms more but then I read online about apertures and sharpness and now I am totally lost. I have like 900 dollars left to spend. I saw a 18-135mm one but then someone said the 16-80mm is better for the sensor? Sorry if this is a dumb question but I am such a newbie and I just need one lens that works for everything from buildings to people...