57, late starter, can this still work without gambling?

Age 57. Due to a combination of caring for family, inconsistent work, and plain old avoidance, I'm only now getting organized. Goal is to retire around 68 if health allows. Risk tolerance: medium-low, because a huge drawdown this close to the finish line would wreck me.

Current allocation on 310k:
- 50% global equities
- 30% bonds
- 20% cash

My worry is that this looks too cautious to catch up, but aggressive feels like trying to repair a leak with fireworks.