Marxism is not about fixed ontological categories like you're describing, it's about understanding the universe and society as a processes which develops accord

Marxism is not about fixed ontological categories like you're describing, it's about understanding the universe and society as a processes which develops according to interrelated dynamic forces. My understanding of class in Marxism is that there are only two polarities or tendencies in modern society: bourgeoisie and proletariat. The former lives off private profit and the latter lives off selling their basic labor. No one fits cleanly into either, but as history unfolds people's relationships to the economy will tend to develop toward one of those poles. With stocks, a rental property, and a salaried job in a specialized technical field, you are essentially the modern equivalent of a pre-industrial peasant because you have a certain amount of economic security and guaranteed livelihood. As the rate of profit continues to fall, however, this kind of security will necessarily become inaccessible to the majority of people under the established order, especially on a multi-generational time-scale. This process is called "proletarianization" and the best example of it in our time is the development of the gig economy.