Is it possible that is simply comes down to one competitor trying to cause disruption to another? Even though that would seem the most ridiculous of explanations could that actually be the most plausible?
If your clearnet website has been under almost continuous DDoS then most probably the only beneficiaries from would be competitors. You have only recently launched your business and it has already been coming under sustained DDoS.
Why the hell have all mixers gone under DDoS attacks these days?
There must be a mixer grinch lurking about here.