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".
I like your positive outlook, but at the end of the day, these parties all exist to dissolve France as a state and they most certainly will work together against elements that might stymie the cultural blood loss.
By the way, this is also what's going to happen in Canada next year. Screenshot this post~