Double Eyelid To Monolid?

It is essentially impossible to unfold an eyelid. Making both eyelids have a symmetric double fold is possible. Undoing the fold in the left upper eyelid cannot be accomplished. You may read about surgeons transplanting fat pearls or using fillers to accomplish this. Occasionally I am shown an amazing result that claims to have accomplished this and I think that for a very rare situation, it may occur but generally the results are disappointing and the effort further damages the aesthetics of the eyelid. So please be oh so careful about what you look for.

It's not very predictable, to try and create a "mono-lid" from a double lid.  The Oriental eye has a number of anatomic features that are different than the typical Caucasian eyelid.  The lid crease forms because fibers of the orbicularis muscle insert into the skin.  You couldn't just cut this area out, since scar tissue would re-form the crease.  The Oriental lid also has a little more fat in that area.  Fat grafts or injections could look lumpy under that thin skin. I would advise you to leave it alone - consider it part of the uniqueness of you.

Thank you for your question. It is certainly possible to surgically modify your current supratarsal fold lower on the eyelid to try to achieve a mono Asian lid.
However complete symmetry is going to be very difficult if at all possible because the mono lid on your right side most likely has a different amount and distribution of fat which is contributing to the appearance of the mono fold on your right side.
Photographs would help evaluate whether this is possible for you.
If you do choose to see a surgeon be certain that you see a plastic surgeon who is certified by the American Board of Plastic Surgery or a board-certified ophthalmologist who has had training in oculoplastic surgery and/or experienced in operating on Asian eyelids.