Greetings @Lewd_Lawliet
Welcome to the Unreal Engine Community Forum! I was actually working with someone recently on this same issue. Are you using ‘Spotlight’, by chance?(If so, try disabling and see if that helps the fuzziness) If not, check your anti-aliasing. I’ve also saw some community members have success resolving this by setting all of the settings to Cast Deep Shadow. Let me know how that works or if it doesn’t. I’ll monitor the thread. Thanks!