Trading is a Full time and Part time both type of Work depends on your investment..
In my humble opinion it should be part time only, trading as a full time job is not a great decision to take, i know that many people do it, but it is not good to do so and new traders who want to follow that line may find themselves in a financial mess no sooner than they had started their trading journey. A trader without a job will become a liability very fast, except such person is 'bankrolled' from an external source.
You say that crypto trading should be part time, it's because you have trouble making profit from trading continuously. Even though there are some
people who have succeeded in making trading their main job, because whatever our job is if we do it well, of course it could be something to rely on.
Likewise with trading, if we have managed to get large profits on an ongoing basis from trading, it means that trading can indeed become a full time job.
Moreover, I know some of my friends who make trading as a full time job and they managed to make their lives better. So in the end it depends on
ourselves, we can determine whether trading is suitable as full time or part time. What is certain is that it must be admitted that being a successful
trader is not easy, that's why the number of full time traders is not as much as part time traders.