I think you have a cicatricial retraction in the vulvar region, more important at the vaginal introitus (aperture).
I can't estimate if there are retraction inside the vagina, but I think it doesn't exists.
I think that the treatment could be resection of some areas of cicatricial skin and grafts or local flaps.
As any circular scar, it can retract again (stenosis), so the use of a vaginal splint for some months, as used in vaginal reconstruction, may be useful.
The use of low laser therapy in the post op may reduces the retraction.
If you are in the climaterio, near the menopause, you can have atrophy and the use of topical hormonal agents may be useful to achieve better results of surgery.
I don't know the health system of your country, but I suggest that you can discuss these suggestions with a plastic surgeon and your ginecologist.