Hello there Kieun. Exercises that I always run through at home when I've got time are changing posture from left to right, tai sabaki (varying distance covered) and Irimi. Other good though maybe more controversial exercises are press ups on the backs of the wrists. These build strength and flexibilty in the wrists and also develop the spirit. When training on your own, try to to train with the mindset that you always have an opponent. This will bring your solo training to life.
All the best with your training.