Likely a stupid question…Is Earth getting “thicker”?

Ok so obviously I’m not very educated on geology and such. I’ve had this question in my mind for decades since I first heard of ancient cities and structures being discovered under modern cities. When I’d look at pictures, it looks like street level today is at roof level of back in the day. I understand the rock cycle where the mantle gets melted and creates new rock at some point but that doesn’t explain this. For years in my head I keep wondering if Earth is getting “thicker” from humans building on top of old structure. I know this is likely not the case and I probably sound stupid lol so I’d love for someone who does know about this to explain