PBS Space Time is the real heavyweight of science youtube, bit of a one-stop-shop for more advanced science questions.
Problem is you can't jump straight in. It's proper education, so it builds on itself in layers, and you need the previous layers to be able to work with future ones. You need at least a fluent HS level of physics and algebra to be able to run with them, and if you go there for the answer to one question, you might find yourself going back down a tree of their previous vids just to pick up that important background/foundational stuff that is necessary to see how it all fits together.
Otherwise it's science-flavored word salad.
Nile, on the other hand, is immediately accessible. He's doing hands-on laboratory stuff, and explaining particularly important basics as he goes. Chemistry background helps, but is not actually necessary. Love that dude, he's great.
Also, if you like Dr Becky, check out Sabine Hossenfelder.
Also, props to SEA, who imo strikes the best balance of everyone in the space science community between accessibility and scientific accuracy. As opposed to someone like Astrum, who occasionally will be inaccurate, but is more science entertainment anyway.
Lastly, going to throw out Journey to the Microcosmos' microscopy vids. Big and far away is cool, but small and right on top of you is kinda cool too. They're basically nature documentaries, just ... bacteria instead of lions and zebras and shit.
Lastly, the Godfather himself, Mark Rober for mechanical/electrical engineering, and how to use ultra-fine glitter and fart spray to fight package thieves: https://youtube.com/@MarkRober
You changed the world, Mark.
Once you start digging through enough of these, the algorithm will pick up that you like good science stuff, and will start helping you out a little. There's thousands of them now, professionals, working fully within their areas of demonstrated expertise. I recommend googling their full names and checking their background before trusting them yourself. This is like, off the top of my head, though, just some of my favorites for evening background audio.
There's also whole worlds of math youtubers in-line with all the above, that are outside the scope of this question.
I'll edit if I think of more. I probably will.
edit: I do realize several of these, such as the astrophysicists, are not experimental. I'm digging for more experiment-oriented types, but neither my memory nor my algorithm is helping.
I mostly don't need a 1:1 replacement, just great content. There is more great content added in a day than there are hours - even if I watch on 2x speed. Note that I reduced this great content as opposed to the junk and there is still more than enough. Just give me some of that content and I'm happy. (junk vs great is in the eye of the beholder)
Cody's Lab. He has been building a Mars base in the Utah desert for a couple of years now, including not being able to work on stuff without a "space suit" or Robo Cody. He also does a lot of very interesting science experiments involving chemistry, engineering, and geology.
Styropyro. Very hard to describe, seriously just watch one of his videos, your mind may be blown (by lasers or very large battery arrays, who knows!)
For explosives there Ordnance Lab, they have the paperwork for all kinds of stuff the Mythbusters couldn't get their hands on.
Modern History TV for medieval life.
Tod's Workshop for pre modern weapons.
Grand Thumb for firearms.
Townsends for colonial/revolutionary american food and lifestyle.
Primative Technology.
Miniminuteman, archaeology.
Chemistry YouTube:
Explosions and Fire, for an Australian synthesizing explosives in a shed.
Nilered for interesting chemistry in an actual lab.
Various others.
How to Cook That debunking cooking myths and tiktocs.
Donut Media, car stuff.
Visual effects and debunking:
Captain Disillusion
Corridor Crew
Law:
Legal Eagle
Steve Lehto
Special mentions:
Lindybeige
Sabine Hossenfelder
Start looking into this and you get loads more in your recommended. For all the low effort R-ddit and meme channels there are loads of people working on high quality content. Learning YouTube is vast once you get into it. Nebula is pretty good too.
How the monetization of content, even in cases where the content is good and I enjoy the creator, leads to a loss of freedoms online by contributing to laws and tools used to force other creators out of spaces and restrict access to content the was open and free in the past like archival sites. Contributing to a worsening of online services and experience for all over time. And as the generation that are early adopters we are doing a disservice to future generations by not shoring up the things that make being online great and instead allowing it to become a billboard like a NASCAR fender while "look how this bridge is created, like and subscribe" plays in the background