First thing I do is to double check. You don't just send your funds to a website you haven't used before that was your big mistake. By the way how did you get to know about mixero? If someone had introduced you to it then they should have properly guided you and if you had stumbled on it you check to confirm if it is actually legit.
The way you knew you can report your loss here that is the same energy or instinct you should have probably used to ask questions here before sending your funds. I sympathize with you but  prevention is always better that cure.