Wrinkle Botox cycle, the goal is a natural expression.

I am considering wrinkle Botox because wrinkles form on my forehead and between my eyebrows when I smile or frown. I searched for information on the treatment interval and found many comments stating that the duration of the effects varies from person to person. I am curious about the criteria typically used to determine the treatment cycle. Can the interval be affected by the treatment area or muscle movements? If this is my first time, I would also like to know if I should schedule a consultation when the effects begin to wear off. Rather than completely eliminating wrinkles, I want to create a slightly softer impression while maintaining natural facial expressions. I am wondering if there is a possibility that my facial expressions might look unnatural if the interval is set too short. How should I explain the desired look when determining the dosage and treatment area before the procedure? I would also like to know if there are any precautions I should take besides cost and duration. For those who have received the treatment, what criteria did you use to decide when to get a follow-up? Since this is my first time, I have many questions, so I would appreciate it if you could share your experiences.