This is a “recovery scam”. Recovery scammers will claim to be - or will claim to know - “experts” who can help those who were scammed trace and recover their lost assets. Once someone contacts a recovery scammer, the scammer may try to convince the client that they’re “legit” or “reliable” - this may include fake/photoshopped evidence of them successfully helping other clients. Soon after, the scammer will begin to give excuses as to why they need the client to send them money - the most common excuse/reason is that they need money to pay for special tools/equipment that can be used to start tracing the assets. If the client decides to send money, the scammer will either continue giving excuses to try to get more money, or they’ll leave with the money and ghost the client/victim.
If you’re a scam victim, do not trust anyone who tells you that they or someone they know can “recover [your] assets” - they’re lying and will try to scam you. If you were scammed very recently, you can contact your bank/card provider to explain the situation and then see what they can do. You can also contact your local or federal anti-fraud/scam commission to notify them of the incident, as well. There’s no guarantee that anything can be done, but you have a higher chance of success by resolving the issue through your bank/card provider/law enforcement than by letting a random stranger “recover your assets” through WhatsApp.