1) Assigning more challenging coursework.
2) Ranked grading, or "grading on a curve", provides a constant distribution of marks over a given range, since a student is only evaluated next to their peers. However, since each student is not marked on individual merit, those receiving high marks in a poorly performing class may well be less qualified than those receiving poor marks in a highly achieving class, thus poorly reflecting on the student's outcomes.
3) Report grades on a 100 point scale rather than on a 4.0 point scale.
4) Another solution could come from employers which could consider asking candidates, during job interviews, to show samples of their academic work (like test papers, essays, project write-ups etc.).