As you go into more advanced topics, youtube might to be the best media. Have you tried looking into books about topics that interest you?
In my personal exp as a late-twenties self-learner: finding high-quality sources of information is simple, identifying best relevance and staying focused is not. Perfectionism over resources is a total disaster for productivity. (And very mediocre, very shiny resources are easy and mildly profitable to create, and are often more for the authors' benefit than for the public good.)
Good heuristics are a savior - search for talks from authors of textbooks and langs, subscribe to those high-quality conferences (I like PapersWeLove), mentally blacklist channels judiciously.
Even if you only study/work on your own, there are conferences, meetups, user groups, social/networking events, etc... That gives you the added bonus of being more than just a blip in the view count of the person you're learning from. Worst case, even if there aren't any in-person options in your area, try forums/chat rooms/etc... with a focus on your subject(s) of interest (especially if they're more learning focused ones rather than just social -- the communities around many of the MOOC and online bootcamp programs come to mind.)