Expanding my ETF for more stability

I started at the last quarter of last year and started of with $VUSA (+0,53 %) now this year i want to expand my ETF’S for more stability any advise ?

I was personally thinking to add these to my portfolio: $SPPW (+0,41 %) or $IWDA (+0,38 %) , $SPYI (+0,37 %) , $VWRL (+0,41 %)

any feedback is welcome