Just an idea, put a notice on your website that it is for sale. See who contacts you, it may actually give some indication as to who is behind this. If it is someone in competition with you, they will probably be curious enough to contact you for the price. Make it very cheap and see if you can find out who it is.
If that fails, after a few weeks post the website has been sold and transfer the domain to a different register using domain ID protect and see if the attack drops or continues. It may not be your website their after but you personally, so if they think its sold they may drop off.
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