What is the most effective treatment for nasolabial folds?

Hello ~ I am a woman in my late 30s ^^
I'm asking because I'm curious which treatment is the most effective for nasolabial folds!
Um... lately, my nasolabial folds look so prominent whenever I take photos, it's really stressing me out. Haha. A friend suddenly brought it up again.
I've been told that this makes me look tired and older... so I'm considering getting another procedure.
Fillers look good too as a simple procedure....
I am wondering if the thread lift I had done on my forehead before is still effective, and regarding laser treatments like Ulthera and Shurink, what about procedures for nasolabial folds?
I'm not sure what really works.

I'm wondering which nasolabial fold treatment offers natural improvement while also being cost-effective!!