Sell losing stocks and re-invest in ETF or keep holding while investing incoming cash?

Considering few options as I realize investing in some individual stocks wasn't the best of my decisions.. sharing some portfolio details below but need help deciding:

1. If I should sell all losing positions and then re-invest into an ETF
2. If I should DCA into a couple of these positions and sell the rest
3. If I should hold and wait it out

Portfolio details:

• Overall portfolio down $9.3k (-12.4%)
• Cash on hand: $10k (17.1% of portfolio)
• Losing positions:
  • NIO: -$2.5k (-87%)
  • MSEGX: -$6.2k (-65%)
  • ENPH: -$3k (-45%)
  • QQQ Short: -$6.5k (-34%)
  • NVDA Short: -$3.1k (-80%)

I have 15 other individual stocks but all are green. Looking to consolidate to 10 and then rest going into S&P.

I tried finding a calculator online which can help me figure out what the potential return would be if I sold all the losers and re-invested into SPY and held for 20+ years vs. if I held these (hoping to bounce) and continued investing into ETF with my spare cash and monthly investments.

Appreciate the help/advice and happy to share more details.