The vowel letter o is pronounced short. vowel/?/in stresses the closed syllable. When pronouncing, the tip of the tongue is close to the lower teeth, the back of the tongue is upturned, the gums are almost completely open, the mouth is wide and the lips are round. This sound mostly appears at the beginning and middle of words, such as:

Bull (castrated)

On at the top (emphasis on contact or area adhesion)

Octopus octopus

Box box

Socks. Socks

Operation, operation

Ostrich ostrich

I hope it can help you solve the problem.