Thanks a lot!
So, as I understand, I have paid 0.002BTC for 20 transactions. The need time I sign a transaction from my multi sign Electrum wallet, I will just pay 0.0001 BTC/tx, right?
Unfortunately, you will have to use a fee that is in accordance with the current average fee or slightly higher if you want your transaction to be confirmed within a reasonable time frame.
This means that sending a 0.0001 BTC for a transaction right now means that the transaction will never confirm and will stay in the mempool until it is dropped.
You can use this website to determine what fees to use for your transactions:
https://bitcoinfees.earn.com/