In an answer of a topic which does not really relate to my question, the following is written:
The best way to maintain privacy is by running your own full node and also using different address for different transactions. If you run your own node and then point electrum server towards it then your privacy might be protected and you won’t depend on other nodes for information and also you can use Tor or VPN to hide your IP too if you’re connected to other nodes
It is worth mentioning also that running your own node or personal electrum server should be connected with Tor for privacy reason. Connecting it with IP is not private enough as your Internet network provider can still see some information about you and that you are using Bitcoin Core.
Question:
How does it work to connect to my own fullnode without IP? Copy the the transaction physically to the full node, e.g. by using an USB stick?