Both Melenchon and Le Pen have promised to increase spending and reduce taxes. That type of promise is a great vote winner, and people believe it. In 2022 Pecrese advocated reducing spending in 2022 and couldn't even manage 5% of the vote.

Macron couldn't even increase retirement age to 65 because France doesn't want it.

Next time will likely be a choice of two parties who both said retirement age will be reduced to 60.