If you use a plugin like this
https://wpml.org/ (that one is paid but probably there will be free ones) you can direct users to the portuguese or english version according with their location so you do not have to make 2 blogs.
Also a lot easier to do SEO to just 1 blog than to 2... although i never did SEO to a multilingual site so not sure how hard or not it can become.
But then again, if you look at your analytics and the Portuguese traffic have kept flowing in and you got some traffic from other countries since you changed to English then maybe you have it right just as it is... :d