Pillar Candles Partly Burned Pillar Candles, Can I Get More Life Out Of Them?

Partly burned pillar candles, can I get more life out of them? - pillar candles

I have some big (pay lot) candles, an inch or less burned, and the game was reduced to the level of wax inside the crater, where the fire was. It seems that there is more that make these changes, how can I prolong the life? Thanks for the ideas ....