For the biggest impact, aim to increase both elements associated with the area you wish to improve, while reducing the other three.
For example, for Tree energy, bring in living plants, the colour green and the shape of an upward rectangle
A tree will die without water, so Water energy is needed here too. Bring in actual water, the colours blue and black or the shape of a wavy pattern as shown
Now we need to reduce the three controlling elements.
- Metal will cut tree (i.e. an axe).
- Earth will absorb Water which feeds Tree.
- Fire needs Tree to burn, so Tree is drained by Fire.
The same principle applies to the other elements. Increase the two nourishing and reduce the three which control.
The most powerful enhancement is to bring in the actual element, rather than the colours or shapes of it, so actual fire, earth, metal, water or plants.