Lawyers need fame and the ability to make money. If we say which is the most profitable, it is of course related to the economy, such as property rights and civil affairs. Marriage sometimes involves property issues and cannot be generalized. If you look at the charging standards of lawyer services, you will get a general idea of what kind of legal problems lawyers handle and where they make the most money.
Various localities have formulated specific standards according to the Interim Measures for the Administration of Lawyers' Service Fees.