Buy All Of Steam -

You can use the SteamDB Free Packages tool and a browser extension to mass-activate thousands of free-to-play games and DLCs simultaneously.

Buying every item on Steam is a massive undertaking that currently costs . While there is no official "buy all" button, you can track the total price and manage large purchases through specific community tools and Steam features. Total Cost to Buy Everything buy all of steam

Steam Support generally does not offer a "buy all" package for standard consumers. You can use the SteamDB Free Packages tool