Your best option is to open the tablet and try to gently push the card out from the back of the SIM card reader.
Trying from the front may only damage the card reader pins more than hopefully they haven’t been already.
Here’s the Ifixit Samsung Galaxy Tab A 9.7 Repair guides. I realize that you said that your model was an SM-P555 but there is no difference in opening it to access the systemboard. Your model has 3G/LTE capability and the T550 doesn’t.
Worst case is that even if you get the SIM card out is the card reader (supplier example only - part is compatible with a SM-P555) has been damaged and will have to be replaced. You will need smd soldering skills and tools to do the repair.
If trying this seems too daunting, contact a reputable, professional mobile phone repair service and ask for a quote.
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