These graphs are misleading because they do not accurately reflect the change in cases. Cases in the Omicron wave are probably closer to 10x the winter of 2021 than the 1.5x in those graphs, but testing sites have been overwhelmed and rapid tests are more widely available, leading most people to either test at home or simply give up.

For reference to a Covid prevalence measurement that isn't sensitive to testing artifacts, check out the Boston wastewater analysis: https://www.mwra.com/biobot/biobotdata.htm