Several diplomas enable you to work in several fields. One in accounting is a live example.
Some sectors, yet, are not going to last strong as they have been until now, while other ones are going to prosper. If you would like to make a smart move in your career, you need to select the field which suits your potential and dreams.
Before you start looking for a job, you can follow this path:
Select a domain, which you like the most or study about,
Study its law,
Learn about how things are going on in it,
Know its constraints,
Take a deep look at its laws,
Check how politics can affect it,
List all that operate in it including suppliers, competitors, competitors, etc.
When you feel that you have learned much about the above, you will be super ready for any interview, although it is going to be your first experience in it.
The more knowledgeable you are, the more ready you are for interviews, and the more you can go in comparison to other candidates.