What am I doing wrong? Gauge

How do I get my gauge right?! I am making my own cowl design using larger size needles [19]. I made a swatch and blocked it and still not getting the gauge for the size I want. What am I doing wrong?

Gauge is determined not only by needle size, but by yarn weight. You may need a larger or smaller needle to get gauge. If you like fabric with a selected needle size you can also use more or less stitches to get the size you want even if you don’t have gauge. Cowls are kind of forgiving if they are slightly off whereas a sweater needs to be more fitted.

Thank you!