Really depends on what you want to check out. Here are some of my favorites in no particular order but roughly ordered by topic.

Science

• Astrum - various space and planets related topics
• Geschichtsfenster - A German channel on medieval topics and reactions to documentaries
• Raumzeit - Vlog der Zukunft - A German channel about space and science
• Urknall, Weltall und das Leben - A German science channel with focus on space topics

Technology

• Cathode Ray Dude - In-detail videos on 2000's tech with focus on audio/video hardware
• Lost In Tech - Videos on 3D printing and 3D printers
• my mechanics - High quality "restoration ASMR"
• The 8-Bit Guy - Videos about 1980's computer technology
• Brodie Robertson - News and commentary on various Linux and FOSS topics
• ThePrimeagen - Reactions on various coding-related content
• Kevin Powell - CSS tutorials and videos on CSS development
• Zack Freedman - Could be best described as "open source craftmanship"

Gaming

• aCookieGod - Minecraft mega builds in hardcore mode
• Fan The Deck - Steam Deck news and commentary
• Karl Jobst - Documentations on gaming history and speedruns
• Shulkercraft - Minecraft videos about creative and large build projects
• Summoning Salt - Video games speedrun history and documentation

3D printing

• 3D Printing Nerd - A channel about 3D printing topics
• CNC Kitchen - Mainly 3D printing content