Short/Midterm ETF Diversification

What are you guys holding outside the core index funds? I want to gradually allocate 10-15% into some other ETFs and could use some ideas. My shortlist right now: Momentum, Asia ex-China/Japan, or semiconductors, but I am open to suggestions. I need some EU-domiciled ETFs that are traded on EU-regulated exchanges. I'm a bit hesitant on semiconductors. It feels like I missed the boat and we might be at the peak. I'm guessing the recent bump in Asian stocks is mostly just riding that same semicond