Assuming you intend to retire in SG, you can do a 50:50 split between SG and non-SG etfs.
That’s one idea. I’m not a fan and suggest avoiding any more than 20% (one fifth of stock investing) in any one country’s stock market until you get within 7 to 10 years of drawdown age. Then you’d start gradually, steadily adjusting your portfolio for retirement.
During accumulatin phase I’d be in this sort of posture:
~20% bonds/bond-likes (CPF, SSBs, MBH, possibly a bit of CORP for a large portfolio)
~80% stocks/stock-likes (including the equity in your home), of which
no more than 20% (16% of total) is the lowest cost stock index fund in your expected retirement country (ES3 if Singapore)
the rest in IWDA or VWRD
but if IWDA, you may wish to add a small percentage (10% of IWDA) in EIMI
The above assumes non-U.S. personhood.
Starting 7+ years before drawdown age (10 if you’re an ultra conservative investor),
gradually and steadily adjust your portfolio so it converges to this portfolio at your drawdown age:
~70% bonds/bond-likes (with a small portion in international bonds, such as CORP)
~30% stocks/stock-likes, of which
50% is the lowest cost stock index fund in your retirement country (ES3 if Singapore)
50% is IWDA(+EIMI) or VWRD
You can exclude your fully paid primary residence from drawdown portfolio consideration if you wish. It is stock-like, but I’d be OK with that posture even without counting the primary residence.
These are all my “rules of thumb,” with a lot of professionals backing the basic concepts behind them. Rules of thumb should be adjusted if your situation is peculiar in some way. For example, if you expect to split your time evenly between two retirement countries in two different currency zones — half in Europe and half in Singapore, for example — then your investment posture should be adjusted to reflect that expectation. As another example, if your country’s bond market is terrible (because its currency is terrible, for example), then boost the global bond holding portion to compensate. (Singapore has a quality currency and a small but functional investment grade and high quality sovereign bond market.)