To sound more natural try using these in informal situations. 
Yo
Hiya
Whatsup?
Howdy
Hey hey

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Everyday English with Teacher Alyse

How to Say Hello Like a Native Speaker

In this episode we will have a look at different ways and techniques of dealing with stress. What causes stress? How to eliminate it?

FarsiLounge

FarsiLounge ep.3: Stress Management

In this episode we dive into language learning. Why people learn languages? Why some languages become popular? What happens to the brain as we learn languages? Plus some notes on language families, similarities and differences between languages.

Hope you enjoy!

FarsiLounge ep.2: Learning Languages

In this episode we explore different weather patterns in different parts of earth, and lastly mention about global warming and how we can stop it.