Then you aren’t doing something right - but you don’t need a tutorial, use these settings - exactly:
Change the average bit rate from 3750kbps to 38000kbps (extreme overkill, IMO), maintain 2 Pass with Turbo and employ the LapSharp Filter. Discover if the video is interlaced and if so use Yadif default with no detection.
The encode will take hours (days?). Might want to do a Preview before you commit. I would.
