Potential answers for "Intensify one's efforts"

⭐⭐⭐⭐ BEARDOWN
⭐⭐⭐ REDOUBLE
⭐⭐ ENLIVEN
⭐⭐ HEATUP
⭐⭐ ENHANCE
⭐⭐ REVUP
⭐⭐ ESCALATE
⭐⭐ STEPUP
⭐⭐ DEEPEN
⭐⭐ SHARPEN

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