Sorry for the spam, im just really worried because 100 euro's is not nothing for me. Apologies.
I will download electrum now and try to copy wallet.dat
I did not exported the private key yet. I used the commant and typed my password but what do you need to do next?
It says this:
walletpassphrase "passphrase" timeout

Stores the wallet decryption key in memory for 'timeout' seconds.
This is needed prior to performing transactions related to private keys such as sending bitcoins

Arguments:
1. "passphrase" (string, required) The wallet passphrase
2. timeout (numeric, required) The time to keep the decryption key in seconds.

Note:
Issuing the walletpassphrase command while the wallet is already unlocked will set a new unlock
time that overrides the old one.

Examples:

unlock the wallet for 60 seconds
> bitcoin-cli walletpassphrase "my pass phrase" 60