looks like youve got all the screws removed.
try lifting gently around the headphone charging port and see if its caught on anything.
did u spill anything on it before? maybe something sticky? in which case yes youll need to pull harder. its very odd that it wont separate. just take it slow and be sure to look and see where its “tighter” than other places. so like lift one side of the PCB and see if theres any play in the board. that might give you a clue as to where its getting caught.