Your eye is usually already open,either over active on in your case inactive.Chakra doesn't work by just being able to force open just one gate,your body needs to be in balance,This Chakra is said to be your own place of connection to God/Christ/Buddha. A weak crown chakra can cause a feeling of disconnection with the vital flow of life, uninspired, feeling misunderstood and practicing self-denial. Overactive, this may cause a disconnection with the earthly plane, being impractical, not connected with reality, over imaginative.
Gemstones to help strengthen and balance:
clear quartz, amethyst, purple fluorite, sugilite, sapphire
Gemstones to help tone down and balance:
light citrine, golden topaz, light amber
The third eye is just another gate,your body has to be balanced in order to excell in the 3 fields
Each Chakra is associated with a particular part of the body and gland. When the chakras are balanced and energy is flowing freely, a sense of physical well-being is achieved.
When the physical body is in a state of well being, the mind is at ease. When chakras are balanced and energy is flowing freely, a state of mental clarity is attained.
When the chakras are balanced and energy is flowing freely, our energetic vibrational rate rises, allowing us to experience more of our true divine nature and connection with the sea of Universal Life energy that permeates all things.
meditating is also a good way to power up the third eye,just relax and let the answers come to you.But in the end of the day all 7 need to be aligned otherwise you will drain and deplete.Harmony is essential here.Good luck