The silver lining of the election outcome is that the extreme left and center parties have to form a coalition. Even if they manage to formally do that there'll be constant struggle and several such alliances failed across Europe recently.
Macron's interior minister already said he will not support a coalition with the far-left and greens. If that happens he'll be the first to sign a vote of no confidence.
Meanwhile the far-left is organizing a march on the seat of the prime minister in Paris to force Macron to be put in charge of the new government.
For added lulz: some in the socialist German party SPD warned against far-left leader Mélenchon and called him "nationalist, anti-Semitic populist" and "anti-European".
One thing to keep in mind is that it's not too difficult for nationalists to blend in with socialists, and then be the one group of "socialists" willing to actually talk to the working class and address their real concerns rather than try to tell the working class what they should be concerned about. Since leftists fight with each other and accuse each other of being crypto-fascists all the time, the inevitable torrent of sperging you'll elicit from other "socialists" will just be farts in the wind.
Right-wing populists know what people actually care about, and are willing to just get shit done, whereas socialists are a bunch of preening navel-gazers who only resent capitalists because they want to be the ones holding the whip rather than those vulgar bourgeois swine.