(Since you mentioned it) I just recently watched all of Stuff Made Here (brilliant guy and channel). One thing really opened my mind - he built his own CNC machine! Now that I know this I could almost believe that I could build anything too. At least that it's possible to build at home.
Interesting about TikTok. But all the content niches are so segregated now due to algorithm recommendations, I'm not sure if these are being watched by only the interested, or are they watched by "everyone" in general?