How to maximize return using Smartly?

E.g. My Total Deposit S$1000, today's Return After Fee is 1.1% (S$11) , so Total Portfolio Value is S$1011.
Scenario 1: Do nothing until next day. My Total Deposit remains S$1000. RAF next day is 1.0%, so TPV is $1010.
S2: I withdraw S$100, my Total Deposit becomes S$902. RAF 1.0% (S$9.02), so TPV S$911.02.
S3: I withdraw Max. Amt S$1011. And start all over again the next day.

In S2, I have no idea how to get the S$902. But overall I gained S$11.02 (by investing S$1000).
In S3, I gained S$11.