There are several method that you can use to find competitors google Ads. You can use official tools that are available for free. Google AdWords Competitor Analysis Free is available to use free with the help of third party tools as well. Here are the few tools name that you must have to know: Ahrefs SEMrush Spyfu
You can find your competitors' Google Ads by using tools like SEMrush, SpyFu, or Google Ads Transparency Center to view their active and past ad campaigns.