transphencteric fistula is always very notorious, until n unless u get that fully excised it will recurre.
there is various type of treatment option available, but generally general surgeon prefer for seton technique, tighten that seton after every 15days,
seton technique takes time but surely treat fistula nicely.
Next Steps
if u r obese, try n reduce weight, and avoid maximum seating job, use soft pillow for sitting, clean all hair along gluteal cleft, take sitz bath daily with dettol 5m.l after passing stool,