The Brief: Doing the most means putting a lot of effort into something.

DEEP DIVE
The phrase carries a connotation of trying too hard. It is typically used to dragΒ someone for appearing desperate for attention. Someone who is doing the most is extra.
The idiom can carry a note of positivity, though. Stans might use it to boast about their icon’s superior skills or efforts.
stop doing the most before u crash
— KB (@kennethbrotherr) February 8, 2019
my fave doing the mostππππ₯π₯π₯π₯#bbnaija pic.twitter.com/EbVdxaJMUo
— nomazulu (@NomazuluNdlovu1) February 12, 2019