Quite often, players face a problem where the game settings are reset for unknown reasons. Autoexec.cfg will help you out in this situation.
There is a config.cfg file located in the Program Files folder ((x86)/Steam/userdata/Your steamID3/730/local/cfg/config.cfg). To find out your SteamID3, use third-party services.
Or retrieve your link to the trade offer. The only numbers that will be contained in this link are your SteamID3.
Also, at cfg folder, there is a config.cfg file, which contains the settings to be downloaded at the game launch. Usually, all new settings are automatically overwritten in this file, but conflicts may occur in the system, and the settings may be reset.
In this case, you should do the following — Configure the game, save the settings by using the host_writeconfig command; after that, a new config will appear in the same folder as the config.cfg file. Rename the file into autoexec.cfg and add the +exec autoexec.cfg command to the game launch parameters. Done! Your settings will now be automatically applied when you start the game.