Improving your SEM performance is an ongoing and dynamic process that requires constant monitoring, testing, and optimization of your campaigns. To do this, it's important to conduct keyword research and analysis, using relevant, specific, and long-tail keywords that match your audience's intent. Additionally, you should optimize your bids and budget with smart bidding strategies to maximize ROI and efficiency. Furthermore, write compelling and clear ads, and use ad extensions such as sitelinks, callouts, or reviews to enhance ad quality and relevance. Don't forget to create and optimize landing pages for speed, responsiveness, and consistency with ads and keywords. Segmenting and targeting your audience with location, device, time, and demographic criteria can help you reach the right users at the right time. Finally, track and measure performance with analytics tools such as Google Analytics, Microsoft Advertising Intelligence or SEMrush Analytics to collect data and insights.