Something blue-collar-ish, like cleaning, plumbing, construction, repairs. Anything 'trade'. People are significantly less self-sufficient nowadays, and setting

Something blue-collar-ish, like cleaning, plumbing, construction, repairs. Anything 'trade'. People are significantly less self-sufficient nowadays, and setting up a plumbing business (in my country, The Netherlands) would easily get me a million-euro business without too much effort. If it has to be in tech, I would jump on the latest trend and try to squeeze it quickly before moving on.