The problem I have with tracing for learning is it's really easy to disengage your brain and just go over all the lines on autopilot.
The thing is, just seeing that the lines are there can only go so far in learning things like anatomy and perspective. You have to build an understanding of why the lines are there. Really go meta, really start to think of lines as an abstract representation of a boundary of three-dimensional space or matter. That's why just using a trace for basic shapes, or blocking out the volumes tends to be more successful; because you're thinking when you do it.
It's like how just listening to a lecture is okay... but writing notes so you engage with key points is better, and then recapping what you learned in the lecture in your own words is even better.
Comic and animation art is hard because it's not all just about doing whatever you need to do to make the best illo possible. You also need to be consistent and make it feel like all the stuff in your comic/animation is happening to the same people in the same world... and then also you'll need to draw objects, poses, expressions, that'd just... probably not come up in illustration all that much. So the core skill of a comic artist or traditional animator is to be able to draw...basically anything that could exist in a consistent style with everything else. Those core skills of a truly deep understanding of anatomy and perspective, not in the "I can name all the muscles in the body, look at how well I draw a muscular naked man standing still" or "I can draw a very detailed building in 3-point perspective completely from scratch!" sense, but in the "I can draw two animal people crying and hugging in this very simple, cartoony style that looks nothing like reality both look totally believable in how their bodies are interacting, and provoke an emotional response because of it."
It can make it hard to feel like you're improving at comic art... because weirdly it sometimes feels like only people who aren't really artistically inclined, or people who are really good at comic art can really appreciate truly good comic art... while people who are kinda...mediocre at art will be all Dunning Kreuger effect, "psh, it's not that good a drawing. Look at how much more detailed and fancy my art is!" ...But the proof of the pudding is in the eating, and you'll know you're getting better because the audience will feel more drawn to it, and will connect to it more. In Scott McCloud's books, he calls this "Surface"; some artists are all surface, and lack that fundamental depth of understanding that makes comic art truly great, because they care more about how cool or beautiful their art looks, or how much it shows off their technical skills... not how well it connects the audience with the characters and story.
Really... for me, the best way to improve and to stay motivated has always been "just draw a comic". Draw comics that force you to draw character types and scenarios where you simply cannot tell that story without drawing things that are hard, like tricky environments, actions, expressions etc. Just do your best, and whenever you hit a pose or object where you think "Errr.... what should this be like", break out some real life reference and try to put that in your style. Focus purely on clarity of storytelling and emotional impact, ie. on what your audience's experience of your work is.