The bus was headed off a cliff regardless of who got elected.
There is no easy fix and no strategy that's actually likely to work. What we need is an actual left-wing party. We can either try to push the Democrats in that direction, which fundamentally requires holding them to some basic standard and disciplining them when they fail to live up to it, or we can form a new party from the ground up. Both of those strategies are furthered by voting third party. Of course, there are also strategies that don't rely on electoralism, such as a general strike, but this is also furthered by supporting a third party like PSL which engages in and promotes direct action.