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You state that no brute facts can exist, you state that necessary truths exist in all world, and, you state that contingent truths are ones that only exist in our world. Therefore there should be no 'contingent truth' as everything is derived from the same necessary truths.
This can only be reasoned as there being only '1 world', as no world can exist with different necessary truths. But that does away with the concept of necessary truth. All necessary truths become indistinguishable from brute as we have no means to justify their necessity i.e. we are forced to accept them because "that's just how it is." Ultimately this makes PSR 'self-defeating' by it's own means of existence.
There's nothing here!