If you’re planning on staying in the USA and never leaving, honestly it should be fine to say whatever as long as you’re not advocating for people to do criminal or heinous things. But if you want to visit whatever country you’re referring to, there’s no way to stay completely anonymous without having a a degree and years of experience in cybersecurity
Crypto is a scam, never mess with it again under any circumstance. And just look up how to do a full factory reset on the affected PC, that will guarantee to remove any malware. And make sure your sister is ok, a lot of people lose their mind after losing that amount of money