These two ETFs are 99% correlated. You are paying two expense ratios for zero additional diversification. Consolidate into one position.
VOO + QQQ + XLK are all highly correlated (r ≥ 0.88). A tech sector drawdown of 20% would impact all three simultaneously.
GLD-SPY 60-day correlation dropped from -0.10 to -0.22 over 30 days — strengthening its hedge value. Current allocation may be undersized.