21, Asian. What procedure should I do for my face sagging? (Photo)

Based off the limited photo provided - you have low set fuller cheeks (common with Asian ethnicity) and because you are very young still - you want to seek out treatments / procedures that will help you age gracefully as well. Doing all those external energy devices likely provides very minimal changes plus requires many treatments and likely is creating deeper internal scarring that will result in harder issues for future surgeries. Without a full face picture and multiple angles - its hard to say if a midface lift would help with your lower face and / or buccal fat trimming to help slim the lower face down. The idea is to reduce lower face to be more slim than middle face for a more aesthetic appearance. Recommend you to seek out a few surgeons for some of these possibilities and to also hear what they have to offer that will give you a more permanent result that you are willing to take on the risks to do as well.