What makes you consider cosmetic procedures in the first place?
An exalted Moon ruling your ascendant suggests that you're very pleasant looking, naturally. However, your applying Moon/Saturn conjunction is a significant risk factor for being deeply self critical, especially about topics pertaining to the first house (appearance, your face), the tenth/eleventh (how you're seen publicly, groups, friends), and, likely, Taurean topics (body, body image).
That you're considering lip filler at the age of 20, plus other unspecified cosmetic procedures, bears that out. Lip filler isn't a procedure that would ever be used to correct a real deformity, and it's mostly sought by older women concerned about signs of aging. There's no way you'd have any of those signs at your age.
Right now, you have Uranus moving in to transit your natal Moon, and that's staying in orb for a couple of years. Uranus to Moon, especially in the sign of Taurus and especially when Moon rules your ascendant, suggests a shakeup and profound change in your sense of body image (Taurus), sense of self (first house) and possibly also in your appearance (first house again).
You may feel compelled to change your appearance at this time, due to the energy of that transit. If you do, it's best to do it in a way that will not be permanent and runs no risk of becoming accidentally permanent. Changes made to your appearance under this transit could easily be changes you no longer like after the transit passes. And given how Uranus operates, a cosmetic procedure runs a great risk of mangling your looks instead of improving them. Even non-permanent lip filler could have that effect if something goes wrong with the way the injections are done.
So, it's fine to get a new and different hair cut. It's fine to dye your hair if you want to. It's fine to experiment with makeup or new clothing styles. All that, you can change on a whim. With your hair, anything you do to it will grow out, if nothing else. But doing anything to yourself that can't be easily reversed down the road could have disastrous consequences.