There is always a policy risk when dealing with cpf.
Not unique. Within the next 5 minutes the government could announce their intention to tax "retirement plans" at 26.8%, and almost as quickly that tax policy change could be put into force.
To answer the original question, here's your retirement plan:
1. Have a household budget, revise it periodically, and stick to it. Avoid high cost debt, and (if you have it) retire high cost debt first.
2. Then, after accounting for an emergency reserve fund and reasonable insurance (the "big three" insurance coverages for most people), save.
3. Direct your savings into low cost, passively managed, at least reasonably well diversified investments. Buy those investments on a dollar cost averaging basis using a long-term program, and stick to it. Favor tax advantaged investments first. (CPF is a notable example.) Do not actively trade.
4. There is no step 4. That's it.