Is it be a good idea to raise my eyelid crease to 8 or 9mm?

It seems you have a crease that is obscured by hooding of skin.  If a standard skin only blepharoplasty is done you may have a nice crease show without needing to alter your crease further. 

The problem with raising the crease to 9mm is that it will heal about 2 mm higher.  I do not agree at all that you need a brow lift.  This will put your eyebrow too high and will make you look surgical and skeletonize your eyes.  I also disagree a "subbrow" excision which makes an unsightly scar in a highly visible location.  The idea of a small excision blepharoplasty is a good on but I suspect you will be better off with a crease at 6-7.5mm depending your actual examination.  Finally, depending on how dry your eyes are, a skin only blepharoplasty may be appropriate for you.

 Thank you for your question and sharing your photographs. It appears that you simply need a blepharoplasty. You can keep the lid crease where it is already located. It is true that you do not want to remove too much skin because it should look natural; however, the right amount needs to be removed in order to give you a rejuvenated/youthful appearance. Good luck.

We cannot know what is just right for you, however the current trend in upper lid rejuvenation is keeping the lid crease slightly lower as a high crease can cause the appearance of aging. Removing a very slim strip of muscle is a common method to help set the crease where the surgeon decides it is best. Removing too much skin can indeed cause regrets, and Asian eyelid procedures are a very large topic with goals not quite applicable to what you are in your photos.

The primary goal of blepharoplasty is to rejuvenate the eyelids and the appearance of the eyes.  If your crease is normally positioned lower and this is the way it looked even when you were younger, do you really want to change it?  It seems to me that the goal of your surgery should be to make your eyelids look like a more youthful version of what you already have, while maintaining the same shape and configuration of the crease.   It appears that you would do very well from a simple, conservative blepharoplasty.  

Simple blepharoplasty is good for you and appropriate amount skin excison is needed.After blepharoplasty your brow could be moved down and it make you looks serious.This woud be a reason that your oculoplastic surgeon recommed you elevating your crease instead of removing skin.Endoscopic brow lift or simple sub-brow excision could be considered for your status.thanks