Dear @oneray sir,,,
As a Venezuelan citizen, I was a little surprised to hear that you live in Chile, but after reading your entire post, my reason for surprise disappeared in an instant.

You learned a language from your grandmother but don't remember it anymore. It is natural that if you don't use a language regularly, you will forget it and at some point the whole language will disappear from your memory. The memory may remain of that language.

You usually speak A1 English language which you have mastered through self study. Since English language is used for communication all over the world, I think we all should be proficient in English language.

You are now proficient in a language that helps you to communicate and do business with clients from different countries. In order to reach agreement between two parties in a business deal, the importance of understanding both languages ​​is immense. .

Thank you for presenting such a beautiful post about your language. stay well.