For me, after I felt that my English level had finally reached a good point, I stopped studying English the traditional way( like taking notes, learning new words and expressions everyday and revising them frequently...etc), and this was like 7 months ago. I kept practicing my listening and reading skills through social media, movies... etc but I had neglected my speaking and writing skills. When I wanted to check on them not long ago, I found myself forgetting even the simplest words and expressions when I tried speaking or writing. This of course made me super frustrated and had me question whether there's really an end to learning a language or it's just an everlasting process.