I can only repeat what I already said… in short…
It is what it is… a as is purchase… sorry you had to learn this in such a harsh way… and hope you learned to protect yourself in future purchases…
Nothing you added in your last post changes the reality of the purchase even if it were much newer and you paid much more for it…
Even the original warranty covers ONLY the original owner and only for the stated period of time… anything else is good will and you won’t find that at its age… now if there was a unrepaired recall not disclosed you might have a argument…
I wish you the best of luck going forward, somehow I think you might need it as new and different problems surface on what seems to have been a poorly maintained vehicle…