That is why for such items I don't take risk I rather get lower like some reader say SSB or TBill. For me this item I use endowment insurance tailored for local Uni studies with a guaranteed 50k plus maturity bonus. Based on the guaranteed 50k I work backwards. That era is 18 years ago? where endowment insurance still give ok returns. I just get back part of my premiums paid this year as it work in 20k,10k,10k,10k then maturity bonus. This insurance is not lump sum upfront I pay annually for 15 years then wait for final end give me all monies
Such plan I no need to have a decision when to sell or not as it is already determined 18+ years ago.
Your dilemma just flag out another of my related issue if my investment is in USD when should I sell and change back to SGD once it reach my investment tail end. This is headache indeed as a wrong move means I may actually earn lesser after I sell and convert back to SGD.