Kagi has an option to search the Fediverse. This makes it a lot easier than specifying a site in the search query, which would also limit the results to a specific instance.
Why YSK: This lets you easily replace searches like “some topic reddit” with Lemmy!
You need to sign in to use it. Other than that, the results are more relevant and customizable. You can try it for free when you make a new account.