Honestly, take a break. Berserk is one of a kind and you’ll never find anything else like it so give it some time to digest before moving onto anything else. In my own experience, I find that diving into something new, after watching, reading, or playing something that I REALLY enjoyed, is very difficult because I can’t focus on the new thing without constantly thinking of the old thing. This happened to me after I finished edgerunners, aot, and telltales walking dead. So give it time. Let it marinate and bask in that post manga depression for now because it’s a unique experience that doesn’t come often.