Surely the first step is to stop issuing loans in such a way that will cause the
next generation of students to suffer the same problems, freeing us up to sort out the problems of previous generations without moral hazard.
The UK had what I think was a really nice set up, although it's now not nearly as palatable. My student loan had an interest rate tied to inflation, and repayment was a fixed amount of my income above a limit, collected via the same mechanisms used for income tax. Any unpaid loan would be written off when I turn 60.
The modern system is similar, but the interest rate has been decoupled from inflation which means that instead of paying back essentially the same value, no matter how slowly you pay it off, it's now definitely better to pay more earlier. Which makes it much more like a regressive "graduate tax" that you only have to pay if you don't earn enough.