Welcome in H.C.M.
I have gone through your query regarding perforation in ear drum and loss of hearing. As you are saying that your 75% of left ear drum is damaged and now you are hardly hearing any more from your left ear.
Your problem may be solved by surgery , if on investigation you were found as a case of conductive deafness
than result of operation will be excillent. For your kind information I would like to tell you as you have asked about endoscopic ear surgery, it is not done anywhere, actually we all ent surgeons are doing ear surgery by microscope named as microscopic ear surgery.
Now a days ear surgery are performed by external canal approach, in this method entire operation is performed through ear canal
and no post aural incision is given. I am routinely doing this type of surgery. This needs only one day hospitalization and total recovery takes place in one weeks time.
Don't worry consult your ENT doctor and get yourself examined and investigated to plan out for operation.