Just to expand on what @Syzygium posted…
The one time move is for your character in a single ship filled with everything it can carry, anything else in your item and ship hangars should be sold or freighted out prior to that one time move…
There was a Courier service available in-game that specialized in moving freight through Low and Null Sec space called Black Frog Logistics which also had a High Sec division called Red Frog… I don’t know if they’re still active in-game but definitely something to check out…