If you won't need to touch it for a long time you can try a unit trust, or a trust account at a brokerage. The disadvantage is that it's not PIDM insured. Unit trusts are of course serious long-term investments (maybe 10 years ) so if you know you won't need it for 10 years, that's a good place it. Trust accounts are good if you want a high-interest, low-risk account. It's also not PIDM insured, but the interest is around 2.45-2.98% depending on the brokerage, daily interest credited monthly usually. Also if you want to withdraw any amount, there's no penalty. It's just like a savings account with a bit higher risk (it's not PIDM insured) but a lot higher interest (almost as much as 1-month FD.)

You can do monthly bank in of small amounts with either. There's also something called a PRS where you make an agreement with a brokerage, and they will deduct a certain amount every month and put it in a trust fund (sort of like a Private EPF scheme.)