Some of those that I watch more often on Youtube:
Eons of Battle.
Midwinter Minis.
Eric's Hobby Workshop.
Anvil Of Doom Miniatures.
I like channels that spread hobby joy, creativity, and love for their passion projects. Mellow music, welcoming approach, and videos that works just as well watching them as just listening to them.
Lately I have also been trying to learn more about the Warhammer 40k universe and lore, and the channel Arbitor Ian has been execellent for that.