Oh happy to hear that it's valid advice! I got it from a speaker at a video game making thing I went to years ago that stuck with me.
Talking about it I suddenly have the urge to do it again xD It was very satisfying to compare last weeks drawing to this weeks, and the first drawing in the book to the last one. I can only imagine how satisfying it would be if I stuck with it for a year XD
Yeah I tried making a sour dough starter twice from scratch and it didn't have any oomph to it.
So I just bought one and suddenly boom, perfect XD