Not be someone that is going to push the person that's going to be paying me for what I'm doing here, but if you want you could go ahead and check out the service in my signature. It's reputable and the entire site itself is something that is well known to be good to their word to the entire Bitcoin community, so they wouldn't be a company that would be running off with your money which a lot of the companies in this field are charged with doing.
Though if you don't want to do something like this, I know there are a ton of other options you'd be able to purpose you'd probably be able to go ahead and look through some sort of Reddit or forum site in order to find it. I won't link anything cause I think that you'd probably be caught on some weird site but I'll let ya go ahead.
Good luck be safe and research before you give up those valuable coins.
Seconded. Do your research (this forum is a great resource), making costly mistakes definitely happens (happened to me in another context).
I too have used bitmixer.io many times. The service works very well, but take your time and follow instructions, especially remember to download the Letter of Guarantee.
I decided to join their Signature Campaign because of their excellent service and low fees (semi-random between 0.8% - 1.2% but can be adjusted upward and downward). Various other bitcoin mixers (tumblers) charge over 2%.