Based on recommendations in a discussion, you might find the following lesser-known electronics/maker YouTube channels worth promoting: Peterryseck, AndersNielsenAA, jsincoherency, 6502Nerd, Hjalfi, LucidScience, skyriverSat, slu467, and taylor.galbraith. These channels may have promising content even if their production values aren't top-tier. Supporting active creators could benefit from promotion more immediately.