Question: how to strengthen ajna chakra?
Answer: Practice closed eye meditation. ... 
Put a dab of vibhuti (sacred ash) on your 3rd eye before going to bed and in the morning when you start your day. ... 
Visualize and send the energy from your root chakra up to your 3rd eye. ... 
Ask your inner guidance a question and then wait for an answer. ... 
Burn incense during your meditation.