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bridge cameras are shit and you should've posted this in the dedicated gear thread as well. whatever.
if you want some really specific advice the d7200 with pic related if you want to do some cheap wildlife with decent autofocus(will be completely useless when it becomes darker). the lens is sharp as shit from 70-200mm as , shit at 300mm with APS-C though but usable and at least gives you the option to do 300mm, which becomes 450mm on APS-C which in turn means it has more zoom than the p900.
quality wildlife and zoom in general is expensive and you won't be able to do proper astrophotography with this setup because that requires some really specialized equipment.
if you buy this you at least have a decent camera with a super good lens, buy it used as well so it'll be close to fitting into your budget.