I watched it on YouTube and think it looks good for a YouTube upload. I noticed some compression artifacts, particularly in the shadows, but a lot of that is likely the result of YouTube’s own compression. Did you export using Premiere’s YouTube preset? When exporting, if you select H.264 as your format, then scroll to the bottom of the list of presets, you will see the YouTube selections. That should get you the best result from your end.
Thanks for the shoutout on the YouTube comment 😉