Place it as the reply after a question or a shocked reaction in your edit, then follow it with Oh My God Wow for a bigger reaction or Damn when the answer turns out to be less fine than claimed.
Über diesen Sound
This is a short spoken reply, just under two seconds long, with a single voice saying I'm doing pretty good in a relaxed, unhurried way. It feels calm and lightly confident, like a shrug that says everything is fine without making a big deal of it. The tone is easy and unbothered, which makes it work as a low-key answer rather than a celebration.