High CTR shows relevance, yet limited impression share suggests you're missing auctions due to budget, rank, or coverage. Broad match lets Google surface your ads for more varied queries, while Smart Bidding uses conversion signals to filter intent and adjust bids in real time. However, without strong conversion data, you risk wasted spend and diluted efficiency. A safer approach is testing phrase match expansion first, monitoring search terms, and gradually layering broad match on proven converting keywords.