I've been copying an anime artist every day for at least an hour for 3 months now, complemented with trying to draw characters in the same style from imagination, and I feel like I haven't made any progress since, I still can't summon the right proportions, shapes, features to mind when I look at a blank canvas, and when I make an ugly sketch I don't know where to start fixing it to make it look more accurate to the style

Should I try another approach or just keep at it? Someone suggested memorizing the drawings and trying to redraw them from memory a day later, but that feels counterproductive to me, the artist can draw a variety of characters or invent completely news ones, and have them look accurate regardless of perspective, facial expression etc and memorization feels like the wrong way to get to the goal of also being to invent

Keep in mind I have years of drawing experience already, I'm not a /beg/, I'm just trying to learn an anime-like style, so the lack of progress feels more concerning to me given that I feel like I should have some mastery already, learning everything so far felt a lot more straightforward and obvious