Am booked on BA metal but under an AA code going from Lisbon to LA, connecting in London.

Ba cancelled the LHR-LAX leg, AA rebooked me in Economy (travelling on a J ticket)… I called AA services and there are no seats in J today- at all- even to SFO etc

Therefore I changed my flight to tomorrow AM, in the first available J flight. 12 hours in the last row of economy when a J ticket has been paid just didnt hit the spot… (trying not to sound precious here!) and was under time pressure on the phone to make my LIS-LHR flight.

The really annoying thing is I paid 1300 euros last week to change the flight from Sunday to Monday.I’m now overnight in London so will need a hotel, in addition I’ve missed my LA hotel tonight.

My question is what compensation am I entitled to ask for?

For context on this - I’m a BA Gold (OWE) but no direct status on AA

thank you for the help!!