Diversified portfolio

No

Singapore banks can buy for long term

Have you invested into safer investments like money market funds, T bills, SSB? You are diversify with equities but not bonds or safer assets?

Investing in a more diversified portfolio is generally a good, instead of putting everything into equity investments, especially as you approach retirement. The AGGU fund is an all-in-one global aggregate bond ETF that could help balance out your current equity-heavy portfolio.
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Investing an additional $500 in AGGU seems reasonable, as it represents a small portion of your overall $500 monthly investments. This should help diversify your holdings and reduce overall portfolio risk as you get closer to retirement.
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However, I would caution against making drastic changes to your existing DCA strategy, as it seems to be working well so far. Consistency is important when building long-term wealth.
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It's also beneficial to have some cash on hand for emergencies, and to invest in lower-risk options like the Singapore Savings Bonds (SSB), especially since the interest rates look to remain high in the near future