For wood, bring more plants into your office. Water- and soil-based plants are great for enhancing health and increasing productivity.
For fire, introduce warm colour tones like yellow, orange and pink into your home, and choose warm lighting. White lighting helps bring better energy to any space.
For water, a water feature would be an excellent addition. The sound of water running is ultra-soothing and will bring life into your space.
For metal, in my field we commonly use metal bowls for their ability to minimise negative energy. You can use one as a holdall for keys and change, and to make the most of its properties in 2019, place it in the south-western corner of your home.
For earth, crystals are earth elements, and there are many beautiful crystals that cleanse negative energy. Speak to a crystal expert and get some that are best suited for you. Again, placement is important, and in 2019 you should keep them in the east corner of a space.