Am I a good candidate for lip lift? I'm 23 year old woman.

I've had 5 lip filler treatments during the past 4 years, as I found my lips being a bit too small. However, I've realised the size is not my main issue. When I talk or my mouth is open, all you can see is my lower teeth. Barely any upper teeth show, unless I'm smiling - when smiling you see my upper teeth very clearly, so no problems with that. My philtrum is 20 mm, but I've read 11-13 mm is ideal. I'm not bothered by that itself, only the fact that my upper teeth are "hidden" unless smiling.