Recurrent anal fissure. Supplement?

I've been dealing with an anal fissure for the past 1.7 years. It tends to recur every 3 months, always in the 12 o'clock position, and usually appears as a small cut that heals within a week quickly I drink 2-2.5 liters of water daily, my stools are generally soft. Initially, I used Ayurvedic oils daily, and for the past 1 year, and from last 5months I've been applying Cremagel (diltiazem) twice daily and occasionally Smuth cream in the morning. This helped with healing, but the fissure reoccurred again yesterday after I had one loose motion the day before. Like a very small cut. Most of the time, I experience a burning sensation for about 5 min after passing stool. Now its healing like i dont have pain only burning sensation after motion. And my motion is soft always. Could u plz advise on how I can heal this fissure permanently without surgery bcz i dont have pain and the fissure cut also cant be seen. Recommend an ointment for long term use or any fibre supplement?