"Unfreeze" is wrong. Your kernel is not frozen. In [*] means it is executing, and it will go on executing, the way the Enterprise kept hitting the USS Bozeman in TNG S5E18, "Cause and Effect", stardate 45652.1. The Bozeman never froze. It looped for ninety years. The word is "looping".
Before I help you: what is Rule of Acquisition #1? "Once you have their money, you never give it back." DS9, "The Nagus." You hesitated. The kernel didn't. I have moved your JupyterHub profile down to two cores and put the reason in the ticket: "Ferengi, remedial."
This is TNG S2E11, "Contagion", stardate 42609.1. An Iconian program gets into the ship, the replicator gives Picard a potted plant instead of tea, and he says, "Now, that should not have happened." It happened to me in March. A data scientist ran one cell that pulled the whole claims table into a DataFrame, the notebook sat at In [*] all afternoon, and she came to my desk. I put a potted plant next to her monitor and closed the ticket with the episode number.
Your Jupyter kernel is a junior officer, so it is カーネルくん, and it does not get "the kernel". State the language. Python 3 (ipykernel) is a designation, the same way the Enterprise has a suffix: NCC-1701-D, Galaxy class. Scotty would want that suffix made explicit and would want the others left off: "NCC-1701. No bloody A, B, C, or D." TNG S6E4, "Relics", stardate 46125.3. Anyone who says "the Enterprise" without a letter has not seen enough of the franchise to have an opinion about kernels.
The tqdm bar under your stuck cell says three minutes remaining. That is a Scotty estimate. In Star Trek III: The Search for Spock (1984) he quotes eight weeks for a refit and does it in two, and Kirk asks him whether he always multiplies his repair estimates by a factor of four. "How else can I keep my reputation as a miracle worker?" Your progress bar has the reputation and none of the miracle. QI'yaH, which Okrand glosses as a vulgar expression that defies translation, and I am using it accurately.
Your notebook has been open since Tuesday, with forty cells run out of order and a kernel holding everything you ever assigned. Okrand has a proverb for that: 'etlh QorghHa'lu'chugh ragh 'etlh nIvqu' 'ej jejHa'choH. "Even the best blade will rust and grow dull unless it is cared for." The Klingon Way, p.101. Han shot first, and that was settled in 1977, whatever the 1997 Special Edition did to Greedo. yIchu'Ha' 'ej yIchu'qa'. On the Enterprise the way out of the loop was the number three, because Data sent it to himself through the one channel left, and the crew then started seeing it everywhere: "To date, we have encountered 2,085 conspicuous examples of the number three." I counted the threes in your traceback last week. There were eleven.
I wore full TNG gold to the Q3 platform offsite. My manager also wore gold, which is the correct division and the correct era, with the collar piping intact and his combadge at regulation height. There was nothing to correct. I spent forty minutes at the breakfast buffet telling him so, and he has asked me to stop measuring his combadge.
Qapla'! It means success and is said when parting. It does not mean "good luck". Luck plays no part in it.
[HR has requested a translation. HR is still waiting.]