I am more into linguistics stuff than language learning stuff (in terms of content) but here is some random stuff. Probably none of it is suitable for beginners but there is some casual stuff that may be watchable even with low comprehension. Enjoy!
CHANNELS
Big channel focusing on study techniques in general: https://www.youtube.com/@Stardy
A Chinese person who learnt Japanese to an extremely high level, her accent is excellent: https://www.youtube.com/@chinese-muimui
Casual nerdy linguistics chat: https://www.youtube.com/@いのほた言語学チャンネル
Entertaining linguistics videos: https://www.youtube.com/@Gengo_No_Heya
Famous (in a relative sense) linguistics podcast: https://www.youtube.com/@yurugengo
Short infotainment style linguistics videos: https://www.youtube.com/@kotolabo
Someone who studies SE Asian languages: https://www.youtube.com/@hanistudyroom3764/featured
An example of someone who studies English (there are a lot of these kind of channels as English is a popular language): https://www.youtube.com/@eigo_miyu
VIDEOS
Video about learning Korean with Netflix: https://www.youtube.com/watch?v=vVMzaYiB1XM
Guy tries to speedrun output in English: https://www.youtube.com/watch?v=mPZswTQB9WU
Guy explains AJATT in Japanese (high production values): https://youtu.be/mbbvWb1FMrc?si=UjNTiP5b0_qApDkb
Same guy talking about listening (almost the same video honestly): https://youtu.be/hBAsQRPt_rw?si=uODYxZBpS5C35ls_
Foreign guy talking about how he learnt Japanese: https://youtu.be/WtPQnR-wyf8?si=OO95vmjPzR8w_KgG
(In English) The guy above: https://youtu.be/8VyjsgcvUw4?si=fN0rS9m-e3cBS5mz
Casual Japanese polyglot chat (the channel itself is very popular, focused on 英語圏 culture/language): https://www.youtube.com/watch?v=0ubd98ZdNos
Example of someone talking about how they learnt English (most of these kinds of people overestimate their ability and tend to have quite bad prosody/accents so be wary): https://www.youtube.com/watch?v=xRFIK3WUcrU
Steve Kaufmann in Japanese (there are other videos as well - his Japanese is solid but it isn’t a crazy high level or anything considering how long he studied Japanese): https://www.youtube.com/watch?v=d1RMoFBWhWo
You can find an absolute load of videos just by searching on youtube. The above is a mix of stuff I have watched a fair amount of and then things I have come across but barely watched.