That's a worst case scenario. Although there are thousands of "recovery experts" who will offer to help, Bitcoin transactions are not reversible. Those offering to help recover your stolen cryptos really just want to steal more money from you.
What you can do is file reports. If your country has cyberpolice, give them every detail, especially the address of the wallet you sent your BTC to.
eConsumer.gov in the US allows reports of cyberfraud from around the world - and shares those with police and regulators around the world.