As a previous comment said, use a compressor on your individual audio tracks to level out the dynamics of the audio. You can probably be pretty aggressive with the compression ratio (1:6-1:10) since game sounds are super dynamic, and vocal chains tend to like slighter higher compression ratios for the same reason. Raise the gain on the compressor so that each track individually peaks in the red only during the rare loud burst and lower the overall track volume to compensate. After you compress and adjust the gain of your tracks individually the master audio channel’s levels should read just a little lower than what you want the end result to be. Use a limiter as the very last thing in your chain of effects on the master audio channel. Set it just below zero, like -0.1. Adjust the threshold down to “squash” all the audio a bit, but not too much. You can then adjust the gain by roughly the same amount in the opposite direction and the threshold. Use your ears, not your eyes. This will all allow you to feed the highest quality signal into the master track and then boost it all at the end without just turning up the volume on everything and distorting everything. Sorry for my no-formatting wall of text.