Last week, I didn't come up with something for this. Just now I experienced such a moment and remembered that there was a weekly rant on this topic.

The first bug report for my first ever project got resolved and the client commented with thanks and told to keep it up.
It feels awesome.
(tears of joy all over my eyes)

It's a moment that took me more than a year's effort to get a bug report and a positive feedback post it's fix.

I am all motivated now to work even better and wait for such awesome moments.