I'm not really sure how to answer this but yes you can example like working on exchange or writting some blog or making video about crypto, The other way was working as Blockchain developer on some sector like Oil, Market, Food, etc and also being a lawyer or even marketing on some blockchain-based company
It is very possible to work full time in cryptocurrency and earn massively as there are people who are successfully doing this. Cryptocurrency (Bitcoin) since it's launch and few years of existence, it has been evident that cryprocurrency has provided so much opportunities and made alot of people millionaires of themselves despite it's downside and challenges as well.
Cryptocurrency has also tend to break the trend of working 9-5 daily as one can work conveniently and remotely at any given time.
There are lots of opportunities in cryprocurrency as it makes room for bloggers, web and graphics designers, advertisers and lots more and it has also made room for day trading as well.
It is very much possible to choose cryptocurrency as a full time job and also work remotely at any given time as that's what almost everybody wants.