Do you practice visualising daily? Because if you have been practicing for four years and are still unable to properly form images, you may very well have aphantasia.
Do you dream? Can you remember vivid scenes, not just sensations, from your dreams? Can you recall up memories of someone’s face?
in four years I took breaks because I was often demotivated.
yes I dream, yes I can have vivid memories, yes I can see faces.
welcome
Interesting. Then that would mean you don’t have aphantasia. 
There is a member here @Keteriya who does have aphantasia, and she has mentioned not being able to see those things, though she does get impressions, if I remember correctly.
What do you see when you try to visualise? Is the image blurry, fuzzy, or just not there?
when I stare at an object and close my eyes I only see the afterglow under my eyelids
Oh! You’re from the ancient knowledge. Tell us more about your perspectives where you are at, please!