What is Win Rate?
Win Rate is the percentage that measures the total number of impressions won in programmatic buys divided by the total number of impressions bid on. High win rates in terms of programmatic can indicate low bidding competition for the user or website at the price point.
To increase your win rate you can try to increase either your bids rate or bidding price to win more impressions, bid in fewer auctions to reduce the number of impressions bid on, use a pre-bid solution to be more selective on what you are bidding on and blacklist or whitelist select inventory to decrease the number of sites that you have bid on.