What is best lip procedure for a gummy smile? (photo)

I am currently wearingInvisalign which has helped my gummy smile a lot. However, especially very big smiles of laughs I still have a gummy smile on both sides but particularly one side. I am looking for a procedure that will even my lips as one side on the top is thinner but without making my gummy smile worse. I don’t really want ongoing maintenance of fillers. I’d like my lips to look a bit plumper as well as more even. If it also delays marionette lines that would be good. Thanks