Also check that the aux cooluing fan in front of the radiator is working with the Ac on.
If all these are OK then go to a local AC shop and have the pressure checked. I just had the 2 service port valves replaced due to leakage. $22 for the parts fraom the dealer and my local "guy" did the draw down and re-charge of the AC system when the new valves were fitted.

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i