You just came back from PLKN, which means you are still quite young. If it's hormonal acne, even if you try all sorts of remedies, sometimes there's just nothing you can do.

If it's really bad, you can try going to the dermatologist for consultation and they will most likely prescribe pills to be taken.

Different products also work for different people. You just have to go thru lots of trial and error to find what suits your skin best.

Also go thru this thread: https://forum.lowyat.net/topic/308877