If I invest in in VTI, what’s the point of investing in other ETFs?

I’m currently 53% in VTI, and the rest on individual stocks. I’m looking to divest in the latter and move it into VTI. Now, my question is, is there any point investing in other ETFs like healthcare or consumer staples if I’m already investing in VTI? If so, why? $Vanguard Total Stock Market ETF(VTI.US)$ $Direxion Daily Semiconductor Bull 3x Shares ETF(SOXL.US)$ $PHLX Semiconductor Index(.SOX.US)$