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You can always try to thicken the way they look using make up. There's quite a few tutorials on youtube for it.
Although it's not the same as having a doll with thick lips
If a person was determined to do this, my initial thoughts are to roll lip outwards/upwards and make incision on backside of lip and fill from the back where it isn't visible. Now you got me trying to figure out why I just ordered a new doll with small lips.