I personally like going quite in depth into esoteric topics

- car aerodynamics -> https://www.youtube.com/c/KYLEDRIVES

- rockets and space travel -> https://www.youtube.com/c/EverydayAstronaut

- geopolitics -> https://www.youtube.com/c/CaspianReport

- random subjects but always interesting -> https://www.youtube.com/c/PolyMatter