I think the one i already tried is the last one aka "Double spending" but i didn't worked

The "Replace by Fee" could have been perfect for me but it wasn't included in the version of Electrum i was using and the original transaction has to be created with the option in order to work so can't use this one.
And if macbook-air or Quikseller stop by here, i would be more than happy to pay them if they can add the block to their pool

Otherwise i guess i can only wait and hope i never make this mistake again -_-
Thanks for your quick and perfect answer anyway
