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Lasting enhancement of the thin lip is a challenge with solutions that are less than perfect. The fact that there are many solutions to the problem is a testimony that no single treatment conquers the problem for all patients.
Injectable fillers are temporary, or they are relatively permanent and can cause granulomas. (While there have been advances in the filler field, a discussion of them is beyond the scope of this writing.) Insertional fillers (polytef, fascia) become palpable or restrict movement after a while. Surgical techniques are subject to the skill and experience of the surgeon and are not applicable to every patient.
Keller G. Considerations in V-Y Lip Augmentation. Arch Facial Plast Surg. 2004;6(3):179. doi:10.1001/archfaci.6.3.179