I just bought the most expensive PrimeXBT’s promo code (The 50% bonus per every single deposit) and I’m giving it away for free at here:
https://invitation.codes/@criticalbitcoin/prime-xbt
What this Bonus Does? --> Ex: You deposit 0.8 BTC and PrimeXBT will add also 0.8/2 = 0.4 BTC to your deposit. This offer will last 30 days and you'll be able to use this bonus to trade with actual freedom. This bonus applies to every deposit you make. (I paid a lot of money for this promo code, be sure to enjoy it)
I think this is actually the best way to invest bitcoins, just making simple short positions on great brokers with such investment-oriented free bonuses...
You can just use VPN if you're from USA or North Corea (and actually a free one, since these guys(PrimeXBT'staff) never KYC it's users and the service is truly anonymous to begin with) without any worries about your funds.