I think people want to nitpick certain things they have expertise on and say that you can save $XYZ if you know what you’re doing. Well, duh.

On the other hand, while OP’s stuff generally looks like some good decisions were made, there are a few items in there that just seem like criminally bad value for what you get and you wouldn’t spend near that much time and effort switching to something much cheaper. Vercel stuck out to me as one of these