How can I maximise my CPF if I want to achieve at least $700k by age 55?

If (and only if) you are comfortable investing your CPF, then by all means do so because you can do that (in case you don't know). Better to invest your OA but you gotta have a minimum $20,000k inside your account before you can proceed. I feel that investing our CPF is a good enough road to take, knowing that behind it is the government. It makes me feel at ease that CPF has a limit on how much we can invest, like for gold we can only invest 10% of our OA. So there's the restriction according to what the government deems acceptable and maybe lower risk. That's what gives me some assurance. I found this article on CPF investing like how to open an investment account and other FAQs: https://www.vicollege.com/investing-with-cpf-al...

No breakdown of your CPF in OA/SA/MA. If just take blended interest rate of 3%, your CPF total balance would become $400k x 1.03^10 = $537k.

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A few ways to grow your CPF:

1. If your SA hasn't reached FRS ($192k next year), you can transfer the shortfall from OA to SA, effectively increasing the blended interest rate.
2. You can also use cash to top up your SA if it hasn't reached FRS.
3. Continue to work and have MC (mandatory contribution) from employment, just adding $16.3k contribution a year would give you at least $163k, and pushing total CPF balance to more than $700k if you include interests earned along the way.
4. If your total MC hasn't reached annual limit of $37740, you can do VC3AC (voluntary contribution to 3 accounts) to increase your CPF balance.
5. You can also use cash to VCMA if your MA hasn't reached BHS ($66k next year).