My current YT subscription list:
Weird History - Great videos on lesser-known history topics
Роскосмос ТВ - Rocosmos TV. I’m a space nerd, they cover Russian launches and other topics of interest. YT’s auto translation of captions is one of it’s greatest features.
The History Guy - Of all the history related channel, his is probably my favorite.
Sailing SV Delos - One of a few sailing vlogs I follow. They are one of the most well-known and know their stuff.
Sailing Uma - My fav sailing Vlog. I have been following them from the beginning and it was their channel that inspired me to get into sailing and buy/restore my own boat.
Warleaks Military Blog - They feature videos and analysis of current military conflicts. They have been especially useful keeping up with what’s happening on the battlefield in the Ukraine.
美食作家王刚 - Chef Wang, great Chinese cooking channel, I’ve picked up a lot of techniques and recipes from him.
PeriscopeFilm - Another history channel, this one restores and features historical video footage that you simply don’t see anywhere else. They heavily feature military, Cold War, logistics/engineering, aviation, space, and nautical themed videos which are right up my alley.
Ken Heron - I recently got into drone flying and find his videos informative, especially where it concerns laws/regulations affecting drone flying/photography.
De mi Rancho a Tu Cocina - another cooking channel featuring a delightful abuela cooking traditional Mexican cuisine using traditional equipment and techniques.
USHANKA SHOW - Hosted by a Russian-speaking Ukrainian guy who grew up in the Soviet Union and moved to the US in the 90s. His videos feature life in the Soviet union during the cold war and lots of Soviet minutiae. I discovered his channel while watching the HBO Chernobyl mini series, he posted several videos where he dug into the accuracy of the show.
Dark Skies - great aviation channel featuring the more obscure aviation history, especially Cold War era military aircraft.
Dark Seas - just like Dark Skies, but for ships!
Marques Brownlee - tech reviews, we have similar tastes so if he hates/ or loves a product, chances are I would too. Saves me a lot of $$ 
Wind Hippie Sailing - Sailing channel featuring a solo sailor documenting her circumnavigation.
Scott Manley - My go-to guy for keeping up with the space industry.
Chief MAKOi - My go-to guy for keeping up with the shipping industry and documenting life on merchant ships from the perspective of a chief engineer.
How to Sail Oceans - another sailing channel that I like to follow, mainly for picking up techniques. He sails a boat with no engine, old school.
Sam Chui - Sam is the ultimate commercial aviation enthusiast. I’ve been following his since he was just a photographer on Airliners.net. Now he gets behind-the-scenes access to airlines worldwide and has great review videos on just about every airline and commercial aircraft flying today.
Adventures of an Old Sea Dog - Old British guy doing a circumnavigation on his old steel sailboat. I like his sense of humor and his videos are usually interesting.
Driver61 - Good channel on F1 topics, history, tech, etc. from an ex-driver.
Everyday Astronaut - I like Scott Manley better, but he’s good too!
Erik Johnston - Another aviation channel. He features in-depth aircraft walkarounds which I like.
SpaceX - launch videos, enough said.
TRYBALS - Tribal folks from the Sindh region of Pakistan trying out western food/culture. It’s endearing and hilarious.
Answer in Progress - Nerd hacks/deep dives from a female-focused crew is the best way I can describe this. They get into interesting topics.
Eva Zu Beck - Solo overland traveler who goes to some very interesting places.
Stig Aviation - He’s an A&P mechanic for an airline who takes you along on his everyday work.
The 8-bit Guy - Vintage tech deep dives on all the electronic stuff I grew up with.
Hockey Tutorial - My son is a hockey player, I like this guy for techniques and gear reviews. He’s also a black hockey player which still isn’t very common, but very relevant for us.
Veritasium - A more mainstream science channel.
I subscribe to more, but this list covers the majority of my more recent YT viewing. I watch a lot more YT than “regular” TV.
