I would like to see what others are changing when you start a new bag of coffee. I will preface that I only do pourover.
I keep my ratio the same as well as my brew temp/# of pours. I really only adjust my grind size to aim for similar brew times and then from there adjust grind size based on taste/astringency.
What I do is first look at the bean roast profile. I usually buy my coffee from the same roastery, so the profile (for traditional brew) is relatively constant. If I see the profile is darker than the usual, I grind it coarser, and vice versa. Everything else (ratio, brew time, water temp) stay the same.