I don’t know a lot about stocks but I want to know if this strategy can work

Basically stocks on short period like a day are more or less random.
So if i buy let's say 100 different stocks(can be from the stocks that's have been good yesterday or the more versatile ones),
With an order on each stock to sell if it hit +2%, or if it hit -1% and sell the rest at the end of the day
I should on average make something around 1% profit a day minus 0.1% fees so still like 0.9% a day wich is amazing for long periods of times
Explain me why it wouldn't work