What are the new and popular colors to add to a white kitchen?

painting is very personal....https://www.thespruce.com/the-best-kitchen-colors-1822154

Yellow, turquoise, carefully chosen green if you want real pops of color. Peach for more subtle

I suggest keeping all 'investments' neutral as you have done. Use pops of your color of choice with canisters, small appliances like coffee pot or stand mixer, flower pots, kitchen towels, and art work. Use color on your tablescape and chair cushions if you have an eta in area in your kitchen. That way, when you get tired of a color you can change it out at minimal expense. With a neutral background, almost any color works! Just choose one that makes you feel happy.