If your ERC20 Theta Tokens were on a hardware wallet at the time of the snapshot, your mainnet Theta Tokens and Theta Fuel are safe but it will take a bit of extra work to access them on mainnet. You will need to either wait until Ledger/Trezor integrates the new Theta blockchain (working on it, but no ETA since they are back logged) or extract your private key from Ledger/Trezor and import it to the Theta web wallet (this requires some advanced cryptographic knowledge). But your tokens aren't lost, you just might not be able to access them immediately.
Thank you Sir! That solves my problem. Looks like I am forced to hodl Hopefully it will be worth much more once I gain access to it again.