You can use a mixing service that swaps your coins for others with no history. Any of the following four services are reliable.

Unijoin.io
 Unijoin.io is one of the best bitcoin mixers out there, for good reasons.

Click Here

BitMix.biz
Bitmix.biz is a reliable offline bitcoin mixer that takes your privacy seriously.

Click Here

Blender.io
Blender.io is another top offline bitcoin mixer that allows users to send and receive bitcoins without giving away their identity.

Click Here

Cryptomixer
The last thing you want is to be caught mixing your bitcoins with someone else. 

Click Here