I would say - try to divorce work from the context of society and think about what things in general most interest you. Do independent research and really think about it. If you have time/aren't working or studying currently, you could try volunteering somewhere to get your mind jogging. After a bit you should be able to think of a few things that are interesting to you. Then you ask the question "how can I get to doing as much of that stuff as possible under capitalism". And then you dive in. There are no perfect careers, especially in our society. But you may just find one that fulfills you in some sense. Best of luck