I am trying to decide if my werbsite is rubbish or my content is rubbish

Hi all, first time!! I am trying to decide, as I am getting virtually no sales, if my website is not good or if I am trying to sell items which are of no interest. I have persevered over the last five years but I am now loosing the will to continue. Some truthfull comments would be appreciated.

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I am trying to decide if my werbsite is rubbish or my content is rubbish