OBS (Open Broadcaster Software) is free and open source software for video recording and live streaming. Stream to Twitch, YouTube and many other providers or record your own videos with high quality H264 / AAC encoding.
obsproject.com
You didn't restarted OBS after using the Auto-configuration Wizard. Restart the PC just to make sure everythign is set correctly.
Your CPU may not be enough for what you intend to.
A 4k monitor on this GPU is kind of killing it for streaming + any game/3d app.
Your network adapter is working at 100Mbsp intead of 1000Mbps. Check if the network cable is at least cat6. If it is cat6, then look in the adapter parameters to force full gigabyte duplex. Consult the manual of the adapter or support site of the vendor of it on how to achive this.
Realize you're limited by the hardware you have.