Welcome to HCM.
The only option available is surgical correction.
If the gynecomastia
was a side effect of drug then drugs could be used to reverse the procedure, but in your case it is unlikely to be drug induced. You will have to find funds to get the surgery done. Some prefer not to treat it and use tight chest binders to camouflage the projection.
I suggest you get it surgically corrected if possible, because in a minority of cases it may create problems later on.