What can I use to make candle wax last longer?

I need to know what natural things I can use or if I can use to mix in with regular candle wax, such like beeswax and soy wax and palm wax, can I mix it to make the wax last longer to make More Candles. I got to stores and I see the regular wax but no one really knows. I dont want to buy a lot of wax because it is so expensive. I just need to know if i can mix anything to go with it. Any one with an answer can help, mostly partically people that work in a candle making shop or something or some one that makes candles themselves let me know please. I need an answer as soon as possible. Thanks
Can I put shampoo or lotion or fabric softener to add volume in the candle wax to make it go longer as well. I know it might be good for smell, but will this work for volume
Melting the wax first! I want to add the shampoo or fabric softner, or lotion at the end so it doesn’t burn. Yet does add more volume to the wax?

You can add a little petroleum jelly (like Vaseline), but only a small amount (like a tablespoon per pound). This would only be good for container type candles.

Scented soy pillars & other discount soy wax candles

Rosy Rings Etched Plate, Winterberry $12.00 Our metal plates are etched with botanical motifs and finished with a versatile bronze finish. The 7-inch diameter size fits most of our Botanical candles….

Rosy Rings Etched Plate, Cedar $14.00 Our metal plates are etched with botanical motifs and finished with a versatile bronze finish. The 7-inch diameter size fits most of our Botanical candles….

Rosy Rings Silver Scallop Plate $12.00 Antiqued silver plate with scallop pattern. The 7″ diameter size fits most of our Botanical candles….

Lamplight TIKI 1409036 Naturals 6-Ounce Citronella Bamboo Bowl Candle $14.99 TIKI, the brand trusted by millions, helps create a paradise in your backyard. This citronella soy blend wax candle vessel is made from renewable bamboo and has an organic bamboo grain finish. The natural bamboo finish adds ambiance, light and a decorative accent to your outdoor space and matches with almost any outdoor decor. This candle can either blend into your outdoor decor or serve as a cent…

Paddywax Library Collection 9 oz Boxed Glass Candle …

Greenfire Sandalwood Lavender Vanilla blend All Natural Massage Candle (size 1 fluid ounce) $6.99 What is a massage candle? Light the candle and burn it for 15+ minutes to enjoy the wonderful scent. Extinguish the flame, then use it as a warm massage oil. One of the benefits of using Greenfire Candles for massage is that the warm oily wax soothes dry skin: Greenfire’s premium and unique blend of all-natural vegetable and soy waxes is vastly saturated with Vitamin E. Use Greenfire candles for t…