Only a small percentage of laptops (like 1%) gives you the option to upgrade the graphics card. They are gaming laptops and generally start at $1,500+. For example, most of the Alienware laptops allow you to upgrade the graphics card.
Some Falcon Northwest laptops allow you to upgrade as well, but they are expensive; generally starting at $2,000 if not more.
Either soldier on with your current laptop and deal with the low graphics performance, or buy a new laptop with a graphics card that meets your expectations for however many years you would like to use it for games.