How to Repair Mohs Surgery Wound?

Although the wound will eventually heal itself, the scar will be worse and why would anyone want to walk around with a "hole in their head" requiring daily wound care when it can be closed immediately?? Closure of a  Mohs defect depends on the location, size and shape of the wound.. If it is small it closed primarily. If too large for that (e.g the size for example the size of  a silver dollar as in your case then a flap, that is attached nearby is rotated in to fill the defect, or occasionally a skin graft can be used. Often times if you have redundant skin the final scar can be placed in a normal crease line in the forehead. See a board certified plastic surgeon or facial plastic surgeon that has a special interest in Mohs closures.

Ideally, reconstructive surgery repair should take place immediately after eradiation of tumor with Mohs micrographic surgery. If you choose to have a plastic surgeon to do the repair, reconstruction should take place that afternoon or the very next morning to minimize risk of infection. Certain wounds along concavity such as inside of the ears may be amenable to self-granulation without further repair assuming one is consistent with emollient application after Mohs surgery.

Most wounds of the body (including Moh's) will heal by themselves--referred to as healing by "secondary intention". The problems with this is that it may take a long time to close completely and usually, but not always, the scar is worse than if a well-executed surgical closure was performed.
The forehead usually yields very good scars with reconstruction. The surgeon has to plan the operation so that the eyebrows are not asymmetric and the end of the reconstruction and that the scars are properly placed. This can often be done with local anesthesia if cost is an issue. Sutures are out in about a week. The scars fade away over a several months.
I would have opted for closure if I were you, presuming my appreciation of your wound is accurate based on the description.