First of all, you need to see where the coins or tokens are transferred from your wallet. If it is clear that these are deliberate actions and promising coins are stolen, then there was a hack and the rest of the cryptocurrency is also in danger. Next, you need to analyze whether the hacking could have happened through the secret key of the wallet that became known to someone, or, say, through hacking e-mail. I think that you need to transfer the remaining cryptocurrency to a new wallet, and also change the password for e-meil in any case, it will not be superfluous.
In addition, hacking can happen through phishing messages and apps. Therefore, you need to review the passwords stored on the device and remove them from memory as much as possible.
If the cryptocurrency is transferred to the attacker's wallet, in practice it is a loss forever and there is no way to return your cryptocurrency.