Multiple transformers to generate high voltage
For example , 5v * 44 = 220v , and then 220v * 44 = 9680v


Paraphrasing the above quote: Using two cascaded transformers,  the first produces 220V and this feeds into the second that magnifies this by a further 44 times to get 9680 V

It won't work so don't even bother trying it. There are two reasons: -


The magnetic core of the 2nd transformer will heavily saturate and fry (if enough energy could be supplied by the 1st transformer)
The breakdown voltage between consecutive turns (and layers) of a winding intended for 220 VAC might be 1500 V but certainly won't be ~10kV.


Enough said.