i've read about it and come with a conclusion on a website : New users should be warned that if you plan to use a mixer service, be sure to vet its reliability before putting coins into the platform. Some mixers are just scam sites looking to steal your bitcoins. You may also end up with someone elses coins that have a history of criminal activity. In the end, using your own addresses to mix coins may be the most secure method, if less convenient.
so what do you advice me for bitcoin mixer?
Or just try to mix it using the wallet exchange site. I just see it about the little mixer service. but I always using bitmixer and never had a problem. With using the exchange site and you will get new random generate address.