What specifications should my pc have to play DBD at a low/mid-level (for dummies please)

my pc has been degrading as of late after around 8 years of use with little to no maintenance. recently i started playing dbd on pc since this was more cost efficient than Xbox game pass. So for around a month i played fine but now my frame rates have turned unplayable. So if I get new pc/parts what would be the best specifications for this so I can play?

(P.S please explain this in slight dummy terms as I'm not very knowledgeable when it comes to how a computer actually works

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