For me, my comfort channels right now are all of Jimothy Cool's channels, and Shortcat. Jimothy makes Pokemon videos, Shortcat makes Mario Kart videos.
Soursweet - kind and wholesome YouTuber with a soothing voice. Surprising combo of entertaining and cozy vibes watching his edited sessions of playing DayZ, a PvP zombie survival shooter.
ProcessX - Japanese YouTube channel that's shows manufacturing and crafting processes. No talking but English subtitles are available. Lots of satisfying manufacturing noises with soft classical music in the background.