Can you really survive being a freelancer in Singapore?

You can consider conducting courses / training if you have a specific skillset, e.g. coding, baking, etc. Might even want to explore going through online using platforms like Udemy.

Pet-sitting
Tutor
Property agent
Grab driver
There are many freelancing job out there but u will not entitled for employer cpf, medical benefit, insurance coverage compare to normal employee.
To survive, u will need to b very discipline as u basically on yr own.