The mixer not only mixes your bitcoins, it converts them into Monero and then into Bitcoin, which ensures a high degree of anonymity.
It means your mixing services are highly depending on some crypto exchanges? A bitcoin mixing services can do marvelous level of anonymity just by having bitcoins itself and excluding any role by exchanges. Because, exchange hacks are most common these days and your customers need to pay excess fee for converting into monero and then convert back to bitcoins.
Smartmix is a Bitcoin mixer created in january, which allows you to improve your privacy.
In the coming weeks, the site will appear on the clearnet and in classic search engines.
You started in January and it is already April still you need few more weeks to bring a full-fledged services? Getting fully ready must be a good practice before announcing/introducing a services here on this community. I mean your first impression should be the best one.
For the conversion into Monero, this is done through a DEX exchange
There have been some successful FBI attacks on mixers with statistical analysis, especially when it comes to large amounts (by memory, a Silk Road administrator got caught like this)
I try to be as transparent as possible, for the moment the site is in beta version, a letter of guarantee will be added soon