Most effective way to smooth nasolabial folds? (photo)

Hi, I'm currently 31, I started getting fillers for my undereyes and nasolabial folds around age 26 in 2017, since then I get 2 syringes once a year (one for eyes, one for nasolabial folds). My problem is that it's only most effective for about 3 months, then it slowly fades away. I was wondering if there's any permanent surgery for nasolabial folds, or if there's better options like if thread lifting would be more effective. Thanks! ☺️