Value first, personality later
'Your YouTube channel is not about you. It's about your viewers.'
The order most beginners get backwards is value then personality, not personality then value. Peter McKinnon's early personal vlogs went unwatched until he pivoted to short, useful tutorials; Casey Neistat's personality-led audience was built on years of tutorials and gear reviews first. The instruction is therefore to pick a niche you are genuinely interested in AND that lets you add value to someone else - his own being filmmaking and content-creation tutorials. Once trust exists, viewers begin following the person rather than the topic, and only then does the vlog work.
The reason a new channel about someone's life goes nowhere, stated without cruelty.
Your YouTube channel is not about you. It's about your viewers.