Have an Answer?
Do you have current knowledge/experience that you wish to build upon or do you wish to transition to a different career?
The question you ask is very broad and a lot depends on what your long term goals are, your inherent capabilities and skills are and your personal visa/family situation.
So a common answer may be difficult to provide.
However, if you want to see the best careers based on various criteria there are some online resources available:
I'm sure there are others that you can come across using your fav search engine.
Hope this helps.