If you think that Siri Suggestions is generally useful, but don't want Siri to recommend a specific app, you can follow this HowDo to turn it off.
In this HowDo we show how to uninstall an app using Finder. This method works for all apps except those required by Mac, such as many of the apps installed by macOS.
In this HowDo we show how to uninstall an app downloaded from AppStore using Launchpad. If you cannot find the app on Launchpad, you can also do it using Finder.