support or improve something
bolster - support
When you ‘bolster’ something you strengthen or increase it. The word is frequently used in relation to things like a person’s confidence, courage, efforts, chances, etc. It is most commonly encountered in a professional context and has only positive connotations.
Sealing that important deal will no doubt bolster your chances of securing that promotion you’re after.
John is very down after making that costly mistake. We need to find a way of bolstering his confidence.
I think we should add Jane to the task force. Her presence will bolster an already strong team.