Is it a good idea for me to get Alarplasty only? (photos)

You are very pretty.  Dark eyes, beautiful overall facial shape and full lips.  I agree that your ala are somewhat prominent. But I believe part of what you are seeing that is troubling you is that your nasal tip is under projected- a little too short, and maximally rotated upward.  In the profile view, the length of the tip should be about equal to the height of the upper lip.  If you study that ratio in your profile pic, I think you will appreciate that adding some projection to the tip would make your nostrils less distracting and make the small hump less prominent.
Try googling "tip lobule" and "infra tip lobule. Compare tips you find appealing to your nasal tip.
Your nose is NOT a beginner nose. There are many surgeons who have a lot of experience with Asian rhinoplasty. 
While generally I am not a fan of injectable rhinoplasty, you could consider a slight temporary filler augmentation of that area.  It would be like a test drive. But please make sure you use a Doc who has vast experience with rhinoplasty as circulatory complications can occur.  Please don't let a casual injector mess with your nose.

Alar wedge resection as a stand alone procedure is an excellent procedure in the right patient. This is commonly the case in ethnic rhinoplasties such as yours.