YouTube is an engagement engine, their KPI is how much time you waste. People make their living gaming it, so you will not be successful for any length of time curating YouTube to recommend useful things.

You need to look from outside the platform in an in-scope forum. Look for climbers on Twitter or on some forums, etc. I’ve found in a new area that if look at a good book, use the author as a jump point to find Twitter people with useful info. Publishers force authors to tweet and there is good material there.

There’s also hints you can use to assess content. If you see the wide eyed YouTuber face, skip, for example.