What you want to ask is active stretching!

Generally, neck stretching mainly stretches 1 front side (head up) and 2 back side (chin down near clavicle) of the neck.

3 sides (see left and right earlobes close to shoulders) 4 inclined back

The picture comes from the internet.

There is also a turning action.

After tilting, you turn your head to one side and then bow your head.

Keep practicing for 20 seconds, and move slowly, because people with stiff neck will be very fragile, so stretching too hard will hurt them.