A career change resume summary helps the HR understand how your skillset from your previous job can translate into your new one. In that case, it's best to mention: Your current relevant skills or experience. How your background can help you excel at the current job.
How do I mention a career change in resume?
A functional resume is often the best choice for someone switching careers since it puts the focus squarely on your skills and experience (rather than where you worked, and when). This type of resume helps highlights the most relevant parts of your work.