I’m so-so

Although not wrong, ‘so-so’ is seldom used in English.
Instead, people use words such as ‘OK‘, ‘alright‘, and ‘not bad‘.

Wrong	Right
“How are you?” “I’m so-so.”	“How are you?” “I’m Ok.”
I’m a so-so swimmer.	I’m an average swimmer.
The party was so-so.	The party wasn’t bad.