Hi Marjaana,
I primarily recommend storing the product in a dry and cool place and keeping the lid tightly closed so it doesn't dry out. You can also lightly warm the product in your palm before use to soften its consistency.
However, if you want to try this professional tip, even on a slightly dried-out pomade, you can use a light, moisturizing oil like jojoba or argan oil. Just add a small drop of oil once a week and mix it with the product using a clean spatula. Avoid strongly scented or heavy cooking oils to keep the result even.
You can also first test the oil in a small amount of the product or apply it directly to the brush. For example, Maria Åkerberg offers a small jar of jojoba oil that could work for this.
Hope this tip helps! 🌷