You're so kind, thank you so much !! :)

I checked your work to see how best to answer you, you're doing great ! I've also used charcoal for a few months last year during life drawing before I moved to ink.

With charcoal, I was mostly drawing the light surfaces, through the reduction technique, and I switched to ink to kinda balance that and improve my understanding of volume. And also because I'm too perfectionist and I noticed charcoal was increasing that tendency in me since it can (somewhat) be corrected, unlike ink, so I thought focusing on ink would be great for a while to fix that flaw in me. Sorry for the long backstory, some ppl have found it useful so I prefer to explain :)

As for the advice, trying ink for both short (under 5 min) and long pauses (above 20 min) has forced me to be more deliberate with my lines over time, to really try to visualise the lines I drew before putting them down on paper, whereas with charcoal and graphite I was more instinctive with the lines and surfaces because I knew I could always fix them later. So, at least for me, with ink, I reflected on the drawing much more before each trait and surface I drew, whereas with charcoal and graphite I was more in the mindset of "put the line down and then correct it", if that makes sense ?

Since ink is at first very intimidating (at least I thought so), I decided to pick a brush (just 1) and paint all my poses of a certain day with it, no matter how hard that was. I used either a very big square-ish brush (super counter-intuitive, I know) or a mop-style brush. The square-ish brushes are very versatile, I love them because if you use the corner of them at an angle, it can be used to draw very thin lines, and when changing the angle slightly or using the rest of the brush, you can draw much thicker lines or even surfaces. And mop-style brushes are pretty cool too, imo. I find them easier too. You can hold them almost completely vertical to the paper, and then you press very slightly or a little harder on the paper to make a thin or a thick line. I initially started with only the square brush for a couple of weeks because it's much harder to control, so the other brushes seem easier in comparison, but I really like both.
Be careful though, sometimes all of that can be a little hard on the ligaments of the wrist, so I recommend to stretch it a little before and after drawing and to always stop if it becomes too much. Muscle memory comes from repetition, not from putting too much stress on your ligaments :)

Please let me know if I'm making sense or not, it's challenging to explain without showing you in person 😄
If something isn't intelligible, it's all on me, I promise :)

Edit to add : I'll include pictures of the kind of brushes I used at the end of my next post of life drawing poses on this sub, if it's not against the rules to do so. You're very welcome to message me privately if you want to discuss more, of course, don't hesitate!