128g of memory, I only used 30 G. Is it too big?

No, since you have such a large memory, you can use it and do whatever you want. With such a large memory, the system comes with some programs. After counting, there are still many blank memories. You can download more small programs, play slowly, watch slowly, and then gradually become bigger, and the program will be upgraded, occupying more memory, and your available memory will naturally decrease. You're still too old. There aren't that many mobile phones 128g, and system applications occupy memory, which is generally only about 100g. 30g is nothing, only one third is nothing, so feel free to use it. I've used them all before, and there's nothing wrong with 80g. But after a long time, it is best to clean up some useless data. After all, there are too many applications and games, which will still affect the operation of the mobile phone after a long time.