Trading based on someone else's trade could sometimes work but it's not going to last a very long time and I don't think that's a proper long term strategy that you can depend on since even the best traders could lose big and I don't think we have that many good(more than 70% successful trades) traders either, don't trust those screenshots that these random traders share in their page claiming it's their 100th or 1000th consecutive successful trade, they only usually show 10% or less of the bad trades they made and even that is just to make their trading history more natural, in other words only those which are moving the market know where the price will go next and anyone else can only make predictions.