Expanding my ETF for more stability

I started at the last quarter of last year and started of with $VUSA (-0,86 %) 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 (-0,84 %) or $IWDA (-0,81 %) , $SPYI (-0,72 %) , $VWRL (-0,87 %)

any feedback is welcome