boost (someone's) morale

Translations
поднять (кому-то) моральный дух
The manager organized a team-building event to boost the team's morale.
Менеджер организовал тимбилдинг, чтобы поднять моральный дух команды.
Definitions
To improve or enhance someone's confidence, enthusiasm, or overall spirit, often through encouragement, support, or positive reinforcement.