Practice writing with a thicker pen. Will you write with a thinner pen in the future?

No, it may be a little uncomfortable when changing brushes at first because of the different weights of pens, but it will be fine to adjust them. Writing big characters and writing small characters do have different requirements in calligraphy, but if you want to practice calligraphy well, you must adapt to typing small characters. I suggest that every time you change pens, you should carefully understand the difference in feel, which will help you master the essence of different fonts and strokes in writing. I wish you better writing!