I have a website that receives only Brazilian traffic, and even if it did get any foreign traffic it would be of no use. I have registered the same name in both TLDs, and until now the .COM.BR version has been 301 redirected to the .COM version. My question is: should I default it to the .COM.BR version? How would it affect my rankings?
You would not see any big change in ranking I think. But you should stay with the .com domain. Afterall, .COM is the king
Don't change it. Keep the .com. After all, it looks better, easier to type and your url shorter. Keep it as it is ~Mike
Yes, it may impact your rankings. This may improve your Brazilian traffic but influence your global traffic.