Smartphones are convenient, but doing SNS, games, or coupons get tiresome. But I couldn't go back to a life without a smartphone.
Yet I do want to do something about this tiredness that comes from smartphone use!
ご質問ありがとうございます。
"Smartphone are convenient"=「スマホは便利だけど」
"but doing SNS, games, or coupons get tiresome."=「SNS、ゲーム、又はクーポンなどをするのは疲れてしまう。」
"Yet, I couldn't go back to a life without a smartphone."=「でも、スマホの無い人生には戻れない。」
"But I do want to do something about this tiredness that comes from smartphone use!"=「でも、このスマホ疲れを何とかしたい!」
ご参考に。