Do I have to watch the pilot again?
The initial attack force was a City Ship and two Shuttles.
Chokotay destroyed the city ship, at the expense of the Val Jean.
All Voyager had to fight Two shuttles.
Janeway was not afraid of the two shuttles, Caretaker had convinced her that the Kazon were going to steal the Ocampa's water. Just listen to that. Not kill, not eat, not enslave... But "steal their water". The Kazon had no interest in the Ocampa whatsoever other than their water WHICH WAS ONLY VALUABLE ON OCAMPA and would have only been used in the refinery on Ocampa.
She was afraid of reinforcements.
Because this was Kazon space where the Kazon live, so of course they could get 10 more city ships there in under an hour. Ignorant of truefacts Janeway was right to be paranoid because of baseless assumptions.
But from what we know about the kazon, reinforcements from their own sect or another sect would just lead to infighting and powershifts since weakness is not tolerated.
What you're all still forgetting is that the array is a weapon.
It had disruptors that could target the Ocampan city from a couple light years away, and he could have just as easily chosen to target the Kazon living on Ocampa instead, but Caretaker is a deush. Meanwhile they could use the tractor beam that dragged them from the Alpha quadrant to crush their enemies. Safely plotting a course home may take "many hours" but I think crushing a Kazon City Ship is just a matter of randomly thumping the control panels with abandon.
Besides those city ships are cities. 22 times the mass of Voyager means that any one of them is containing 10's of thousands of civilians, whatever mutual defence pacts they have in effect, it can't be worth losing another City ship over, unless your next step was to open fire on Jabin, take the array, and take Ocampa.