
My comments:
To cut loss or to invest more in a dipping market depends on the 1) potential of the market and 2) performance of the the fund itself.
1) If the market drops, it is common that the fund invest in the market drops also.
But if the potential of the market in the future is still bright and the valuation (PER) is still cheap (such as China, Asia Ex Japan), invest more loh.
If no potential (such as REIT) in the near future or the valuation (PER) looks expensive (like Msia, India), dont invest more .
2) if the market did not drop significantly or "flat", but the fund dropped significantly lets say 5% drops more than its peers/ index, it is the time to CUT LOST before it getting worse.
Get IDS as example, compare with Eastspring Small Cap or CIMB Small Cap, FBM Small Cap, IDS drops of -27.4% from the peak is unacceptable, incompatible with its peers, should CUT LOSS before it reach -10%.
It is true that Unit trust is long term investment, but it doesn't mean you buy and hold without monitor or transaction.
When it is time to switch out or switch in, please do so to avoid any further loss or to take profit.
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I invested in UT ~10 years, with IRR as 11.4%

. (In early years, i was very conservative

, else wise IRR will be much higher)
Over these years, value of my UT investment had reached
105 months of my current salary. With 12% p.a., i am earning 1 full month salary from my UT Investment alone, every month.

Basically, i reached financial freedom.
I would like to say UT is an easy and convenient tools for saving ur monthly salary for retirement purpose/ financial freedom.
Dont give up.