I used to put a small book or a pen or something under the front of my laptop to allow more air to get under it. This used to make a big difference (I haven’t played a lot of games in a while). the pads on the bottom of the laptop came off making it flush with the table. Also don’t run it on a glass table.. glass is an insulator that seems to make it a lot hotter.
There are some cheap laptop cooling pads.. I wouldn’t recommend one of these… maybe a more expensive one would work.. I got a targus and it didn’t seem to do much of anything.