Mixers come and go, so if you use them once, don't get attached to it because one day it might disappear.

If you're OK with creating an extra wallet, you can transfer your bitcoins to Samourai Wallet, which has a whirlpool mixing feature based off of Coinjoin (a many-input, many-output featuring inputs from multiple users and outputs going to multiple users), and then you can transfer the bitcoins from Samourai wallet back to your own wallet.

Also keep in mind that exchanges don't play nice to mixers - Don't send mixed BTC to exchanges e.g. Binance or they might give you trouble over it.