Having or not having more kids

First of all, I'm an only child.

I'm 31, married, and have a 18m old daughter. She is a great kid. Sleeps all night, eats her veggies, etc 🤣.

I wasn't even considering having another child until now. I just wonder if we'll be positive for her or it will take all the attention she is getting from.

I'm a SAHM. I take her everywhere (swimming, gym classes, library, etc). I really don't want that to be affected, but I'm afraid that with 2 kids I won't be able to do all. Or that I won't be able to handle it.

I grew up happy, and I don't think I ever needed or missed having a sibiling. So is hard for me to imagine how much my family and life will change having more than one kid.

What made you decide having more kids?