CTR is too low for wallpaper niche website

I have a wallpaper website, the traffic is good, it's around 7000 visitors per day.
but CTR is really low, it's around 0.2%.
I've tried many ways to improve CTR like change ad position but there's no improvement can be seen.

Anyone is having wallpaper website can give me an advice? and tell me your normal CTR is?

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