The other alternative would be, for the pay of the jobs to lower. So you would get 1.500€ more, but your job pays you a similar amount less.
That still has the advantage, that you are not forced to your job that much and it makes changing work easier.
I was wondering about that though. I'm not from the US so I don't understand the depths of the system. But wouldn't a third party only have to get a super tiny amount of votes, to become part of the government? Let's say Democrats and Republicans have 48% of the vote. And there is a third party that got 4% (in actual Electors) .
They would either have to include the small party and make some concessions to them, or agree with the other big party on a president.
Like that it should at least be possible to push a single topic through, like free Medicare. And then just work with whichever party is less against it.