Don't attempt to raise it if you don't know for sure if you have any blockages.
Fully Open Your Chakras,
Clean and Protect Your Aura and Chakras
Tune Your Chakras thru vibration.
You could recite Enochian key.
You can try the Single or Twin Serpent Meditations. But this isn't something you should force.
Advancement isn't a race, it's advisable to move at your own pace.
Also, regarding the blue...Not a bad thing, most likely Demonic energy. Try meditating on different colored auras, or meditate on your third eye, along with the clairaudience and clairvoyance parts to strength your astral senses.
Also make sure your watchtowers are open.
Patience and Persistence is best.