You have to leave. End the session. Get a coke. Play a slot machine. Change a table.
Don’t sit. My last session was on 12/30 at the local casino. Started around 1 pm with $150. I had $550 by 3 pm. I took a food break and returned just before 3:30 pm.
Went totally card dead and proceded to just watch my chips disappear. I said several times to myself to get up, even said that to the player on my left who I struck up a conversation with.
By 7:30 pm, I was busted. Could have left multiple times. Didn’t. Get up and go! No shame in it.