I'm in the "what's next" camp, or in other words, the noob. I went through a career change about 5 years ago to get me here and completely self-taught with the help of slack groups and, well, a lot of Googling. Web analytics/marketing analytics have been where I concentrated my learning to date (in GCP, I'm familiar with Cloud Storage and BQ). All in all, more data, means more sources, and I really enjoy the mapping of it all, so it seems the Professional Data Engineer is the best, next track.