I have used bitcoin mixers before and find them to be a great way to increase the privacy of your transactions. One tip I can give is to do some research and choose a mixer like https://yomix.io which has a good reputation for security and anonymity. Some mixers keep transaction logs, which defeats the purpose of using them. Also, when sending coins through a mixer, be sure to double-check the recipient’s address to make sure they get to the right place.