Can you suggest any methods for awakening the fifth chakra?

A direct way to awaken the heart centre is by using mantras (sacred sound). You can also use meditation practices, for instance trataka. You can purify this chakra using pranayama (breathing). By repeating a mantra you can tap into your consciousness. Yoga mantras are very specific and unique sounds. In this context please do not confuse mantras with positive affirmations. Mantras are unique sound currencies loaded with vibrations. In the yoga traditions you can find literally hundreds of different mantras for varying purposes. The most famous one is OM. The fifth chakra regulates and controls your emotional love states. It is the seat of passion, unconditional love and devotion. It is also the seat of spiritual awakening.