By voting for a centrist government around him you are renewing his mandate to reform France. The french don't fuck around with protests and he's had no end of riots and strikes over his reforms so far. The president is not God, he needs parliament to back him against this.

This is about strengthening his hold to force these reforms through. Hence why he called an election now, that he personally is not at risk from, it's low risk gamble for him personally.

Couple that with him having close to zero chance of getting back in 27 as he's an unpopular cunt as there ever was, this is his last roll of the dice to enact the widespread change he wants.