Invest if ready to hold it for longer periods like 3-5 years and also have money to average at lower levels.
If you take a short term trade manage your risk reward and exit below your SL. Not a good time for holding shares if falling continuously without a SL.
FII's are selling their long term portfolios holding from pre-covid levels. As more valuation to stocks is not possible in the near term. They will return when the valuations are good to re-enter.