If you currently have a youtube channel one good way to figure out what everyone wants to see is to post the question on your channel. You can do a sort of survey or contest to see what people want. Example: they may want to see what is in your bag, what your favorite outfits are, etc.
well it depends on what u do best if u have a best friend or sister u can ask her what is best to do .. possibly try something people wont usually do that would get some people's attention .. :) but if u want something people do then that's Ur choice anyway .. BEST WISHES XD !!