There are some external elements that might be of help to strengthen your aura, like amulets and crystals that will help your soul and mind protect themselves. It is the age of the internet and it would be stupid to feign ignorance about the specifics of things.
Your aura is a precious thing. Your empathy comes from it and it is not only others that gain healing warmth from it: you yourself require the rejuvenating powers of your cleaned up aura. So, you must work hard to strengthen your aura.
Keep in good shape, health-wise. There is a saying in India that the greatest temple of God is the body of the devotee. Keep the beauty of it safe and make sure the pillars hold it up in a proper place.
Be healthy and cling to happiness.
Practice these things to strengthen your aura.
Watch this short meditation video to strengthen your aura
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