Another bachelor or PhD? I have already completed two bachelor's degrees in law and social sciences.  And a master's degree in political science. My field of study is interdisciplinary and focuses on social inequalities.
I want to continue my career as a teacher and researcher at the academy.  But I realized that I need to improve my knowledge and techniques in methods.
What is not clear is the way in which to do this.  What would be better?  Another bachelor's degree in economics / statistics (to deepen model studies and econometrics) or pursue graduate studies with a doctorate?
It is important to say that here in Brazil we do not (usually) have sufficient training in political science methods, so I want to try another bachelor's degree that fills this gap.
Thanks for the help!!! Anyone could help with ideas and opinions, please I would be glad to read.
Edited
An relevant aspect that I didn't mentioned: another bachelor's degree or the doctorate will are both funded.
A third bachelors won't get you very far. Get yourself into a doctoral program, especially if you are interested in research and not just knowing lots of stuff at a relatively lower level.
I don't think a dozen BS/BA degrees will get you an academic job (post secondary) in very many places.
You can learn what you need as you go along, but don't procrastinate.