This is an usual ad design as many ad agencies do the same. Let's start to think about a fresh concept.
Please check the sentence.
Is " think about" suitable for thinking a new concept?
Since "thinking" and "concepts" are pretty much the same process, I would use a different verb or phrasing. Such as: Let's try to come up with a fresh concept. Let's start with the idea that we need a fresh approach.
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Since "thinking" and "concepts" are pretty much the same process, I would use a different verb or phrasing. Such as:
Let's try to come up with a fresh concept.
Let's start with the idea that we need a fresh approach.
Let's try to generate a few fresh ideas.
Let's look for a design that is unusual.
etc.