Please review directions and recommendations on the analyzer:
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
After doing all that, please do a test stream. Once done and stop streaming, and before closing OBS, upload the log file using the built in upload feature you'll find inside Help menu (yes, OBS have an useful Help menu) and copy the URL in here. Also, do check the analyzer again clicking on the Analyze button you'll see once uploading the log file.
With a test I mean start stream, do as you normally do for more than 30 seconds (please do more), then stop streaming and upload the log file. In this order.
According to the log file you attached you do have a network related issue. ISPs normally don't check for the RTMP protocol used for streaming so you need to use this tool to better check for this protocol:
TwitchTest | r1ch.net
Anything bellow 90 quality is bad and most probably and issue on the ISP side, even if they say no to that.
Make sure you're not using any program claiming to make the network better because they don't. Undo any changes this programs do and uninstall them.
Also, some programs cause conflicts:
Known Application Conflicts | OBS