The big reason that Corbyn cannot copy Trump is that he hasn’t learned the lesson of how Trump won. It wasn’t simply by railing against the “rigged system”. Trump won by taking a coalition of the Republican base – minus the elite parts of it such as the Bush family – and bolting on to it two constituencies that Mitt Romney had failed to mobilise four years before. Trump won over enough working-class Democrats and non-voters to get him over the line in the Rust Belt swing states that mattered.
Corbyn isn’t even holding on to Labour’s core vote, let alone winning over parts of the electorate that the party failed to win in 2015.