I hope this attack will be stop as I am not using a TOR browser to do mixing.
Tor would not help you in last few days during the time of the attack, it is just an additional way to protect your privacy (hide real IP), and it can not stop DOS attack.
I will observe first if there will be no more attack that will happen again, then maybe tomorrow I will use this again.
Such attack is not cheap, and whoever was behind it spent what he had, at least for now. Even in case it happens again in time you are mixing your coins, you don't have to worry, few post above ChipMixer is post :
All existing sessions will be extended for another 7 days.