I'm replying based on mixers that I have been using so far.

1, Cryptomixer - I have a good experience so far and I must say that is the best that I have used since Bitmixer.io left the picture. Support is very fast to answer. During the height of bitcoin price, I sent my coins to be mixed, unfortunately I put a small fee and it took 3 weeks before it was confirmed. But the address the mixing services expired (only valid for 24 hours). So I immediately panic because I thought that I lost my coins. Contact their support and I was happy bunny when in the next 24 hours I saw my coins in my wallet.

2. Chipmixer - I also try their services. Very clean. Thumbs up for them.

3. Bitblender - Another superb tumbling services.

If I where in your shoes, you should try the 3 above and see how it goes for you.