When grown out, my hair looks messy. Why?

When grown out, my hair looks messy. Why?

The above image isn’t me but that’s how my hair looks like when it’s grown out except maybe messier. I’m Southeast Asian, I think that might matter I don't know. I would describe it as dry looking but also greasy by the end of the day. How do I fix this?

Combing and brushing doesn’t seem to work. Maybe some leave in conditioner?

When grown out, my hair looks messy. Why?
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