salam alaykoum,
in my view, the growth in the english level depends on how enthusiastic you are ,in order to continue growing you need to continue seeking another english sources.
for intermediate level i think reading newspapers gives a vivid push in both your vocab and also the quality of your english in general ...
anohter point to mention is remark that there are these 4 sections in english speaking,reading,listing and writing ,each skill is developed separately on the other thus you need to spare time and effort on each section consciously ...read a lot, join english debate clubs, and listen to documentaries and medias as much as you can
peace.