boost somebody’s confidence/morale/memory/ego
(increase, raise or make something become better)
boost (v) /buːst/

Examples

1. I will do my best to boost her morale.
2. Your best co-worker will boost your morale at work.
3. My teacher teaches me new skills to boost my confidence.
4. He is going to help his girlfriend to boost her confidence.
5. I myself can boost my team’s confidence.