The studies vary according to which of these is the more problematic, but non-performance of an episiotomy is generally not sited as causative. In fact, the cutting of the tissue may predispose women to pelvic floor relaxation. If the anterior vaginal wall is relaxed and causing the typical bulging, then it is prudent to wait to see what improvement time will bring. Kegels, especially with some feedback about how strong the muscle contraction is, can really help. Some women use vaginal cones, or meters or dials that are available through medical offices or physical therapy centers.
Some relaxation is preventable.
That is why, when giving birth, it is prudent to push slowly as your body tells you, avoid the unnecessary use of forceps, watch your weight gain and exercise, including some form of pelvic muscle exercise several times each day for your whole life. You may be surprised how quickly this improves with proper toning. If possible, I would consult a physical therapist who is experienced in childbirth education. Watch kids controlling behavior of breath holding. Most children do not get enough water in their diet.