Just wanted to pass this along and maybe everyone else already knows this but:
In YouTube under settings you can choose playback speed and it pitch corrects. So basically you can find some japanese content and choose 75% playback speed and it sounds normal just at 75% of the speed. This has made a huge difference in the types of content I can watch and have some level of understanding.
Again sorry if this is super old news to everyone. It made me really happy.