- I created wallet without using tor and made some transaction using x, y, z address <= they know the IPs of these transactions.
You don't know if the node operator is logging information about clients which connect to their node. They
might know that x, y, z address was used by someone from certain IP address.
I transfer all the BTC from x, y, z wallet to the new wallet address.
From now on, I always use a tor wallet. Meaning they will lose my identity? Completely?
Not really. Transactions are not completely private. Everyone is able to track specific inputs and outputs using block explorers. That's why Bitcoin mixing services are so popular. You should also read more about coin control. You can easily control which coins (inputs) you are going to spend but, first, you have to understand why it is important.