Do I need a thread lift or fillers for my Nasiolabial folds? (photo)

I'm a 31 year old, non-smoking female. Developed nasolabial folds very swiftly after turning 30. Have been about 3 stone oveweight since the age of 18 and I feel like the excess facial weight has finally taken a toll on the elasticity and integrity of my skin. Please advise on whether a thread lift or fillers, a combo of both or any other treatment such as botox or ultrasound would be a suitable, long-term solution to eradicate the nasolabial folds.