Adding an 'e'

Yesterday, I was talking to a lady from tai chi class, explaining why I walk with sticks. I said (in Portuguese), "20 years ago, I worked in Africa", but I put an 'e' on the end of "Africa", because that's what you do in Russian. It is funny to me how often I still put an 'e' on the end of a place name. I've been struggling a bit more recently with languages. I was in an Uber the other day with a driver who spoke Russian and Portuguese, and I had no idea which words were from which language. I think some of these issues have gotten worse recently. Hopefully, they will improve when neurofeedback turns down that part of my brain.