Then you should really only consider mass surveillance via cameras as a “big” concern. I’m not much of a travel guy, cause being handicapped has it’s downside, but afaik there aren’t many cameras spread across Europe, mostly near/on main train stations, public transport and similar public places. Use a cap/hat and maybe sunglasses. I haven’t heard of any AI/biometrical real time/logging/analyzing being used in production yet (but it’s being discussed). Don’t use public wifi, get an anonymous simcard (roaming data esims for some crypto-dollars) and a GrapheneOS Pixel smartphone (use it only when needed). Pay by cash and be nice to other humans. And don’t think too much about stuff you can’t control! Don’t let you get mad and restrict your life too hard because of stupid politicians and governments xD
Have fun exploring Europe! Take a look at Italy, Austria, Germany, Switzerland, France, Belgium, Netherlands. Poland and the Czech Republic are nice too, but it’s harder there to communicate in English IME.
Wise words!