I've had a Search campaign running for 2 months, initially set up to maximize clicks, as shown in some YouTube videos. Meanwhile, I launched a Shopping campaign that's performing great, along with two PMAX campaigns—one with my best sellers and the other with products that hadn’t received impressions yet, and everything's working fine. My question is: should I create a new Search campaign with a conversions objective, or can I just change the objective in my existing Search campaign?