What is a hairstyle I can get using hair extension w/highlights. I am 50 years old.

I am 50 years old. I have worn basically the same old drab hairstyle for years. My hair is very thin and I want to put extensions in to make my hair look fuller and to do something different. I have a round face and want to put highlights in it too. Have any suggestions. I do not want short or real long hair

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