In order to look better on your Twitch/YouTube streams, you need to invest in a decent light. The Logitech Litra Glow can help. It has a color temperature range of 2700-6500K with light output of 250 lumens. It is designed to deliver balanced, flattering light to make you look good on video. It comes with a frameless diffuser.
This streaming light is compatible with the Logitech G Hub software. You can use it to adjust color temperature, brightness, and other settings. The Litra Glow can easily be mounted to your monitor. You can find out more about it here.