Well, there are still ways to earn bitcoin without doing trading and mining. Like what you said, earning outside crypto world is possible but you can't really detach your activity from crypto world since you are still aiming to earn bitcoin. No one in the crypto space starts ckean and good, they would need theuirr skills to leverage them in the decebtraluzed world so offering consultations and trainings could be a way to earn, since the demand for blockchain experties with traditional skills is on the rise, one could offer consulting and training servuces to newer blockchain projects.
        The list of people that could earn bitcoin just by doing what they are supposed to do anyway goes on and on, best examples are accountants consukting on fund managements, lawyers specializing in blockchain and crypto law, stock exchange brokers consulting crypto related stuff and such. They could earn whenever they are since its easy to get oaid with bitcoin rather that traditional  way of payment but time consuming.
       In terms of spreading bitcoin and getting non crypto users into using it, edicating the masses about it's advantage and how profitable bitcoin is could be a way or educate and persuade people to study crypto related things so they could offer services to businesses that needs blockchain and crypto expertise.