My current allocation: 60% in Stashaway (mainly US exposure), 40% in Syfe (20% S-Reits, 20% ABF Sg Bond). I want to diversify more. Any recommendations for exposure to new sector/country/region?

I'm a beginner. Just started on ETFs with Stashaway and Syfe. I know it's impt to diversify more but I'm not sure where else I should be looking at to complement my current allocation. Would be very grateful for any advice or if you could point me to specific ETFs to look at. I am more comfortable with ETFs at this moment as I am not confident at stock picking. Thank you.